Glossary

7.1 Passive diffusion and facilitated transport

6 min read•august 1, 2024

and facilitated transport are crucial mechanisms for moving molecules across cell membranes. These processes rely on concentration gradients, allowing substances to flow from high to low concentrations without energy input.

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

While passive diffusion lets small, nonpolar molecules pass through the membrane directly, facilitated transport uses proteins to help larger or charged molecules cross. Both methods play vital roles in cellular function, , and waste removal.

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Passive Diffusion: Principles and Role

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Fundamentals of Passive Diffusion

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Passive diffusion involves the movement of molecules from a region of high concentration to a region of low concentration, driven by the
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • This process occurs without the expenditure of cellular energy (ATP)
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Molecules move down their concentration gradient until equilibrium is reached, at which point the net movement of molecules across the membrane is zero
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The rate of passive diffusion is directly proportional to the steepness of the concentration gradient (a larger difference in concentration results in a faster rate of diffusion)
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Passive Diffusion Across Cell Membranes

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Passive diffusion occurs through the of the cell membrane, allowing certain molecules to pass through without the aid of
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Small, nonpolar molecules (oxygen, carbon dioxide, and certain lipid-soluble molecules like steroids) can easily diffuse through the hydrophobic core of the membrane
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The permeability of the cell membrane to different molecules depends on their size, charge, and polarity
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Larger, polar, or charged molecules have difficulty passing through the membrane via passive diffusion due to their incompatibility with the hydrophobic interior of the bilayer
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Passive diffusion plays a crucial role in the transport of gases across the cell membrane, facilitating (oxygen uptake) and removal of metabolic waste (carbon dioxide release)
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Facilitated Diffusion: Process and Significance

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Mechanism of Facilitated Diffusion

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • is a type of passive transport that involves the movement of specific molecules across the cell membrane with the help of membrane-bound proteins
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • undergo conformational changes to bind and transport specific molecules across the membrane
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Example: Glucose transporter (GLUT) proteins facilitate the uptake of glucose into cells
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • form hydrophilic pores that allow the passage of specific ions or small molecules
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Example: Potassium ion channels allow the selective movement of K+ ions across the membrane
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Facilitated diffusion enables the transport of larger, polar, or charged molecules that cannot easily pass through the phospholipid bilayer
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Significance of Facilitated Diffusion in Biological Systems

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Facilitated diffusion is essential for the uptake of nutrients by cells
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Glucose and amino acid transporters ensure an adequate supply of these vital molecules for cellular metabolism and growth
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Ion channels regulate the concentration of ions (sodium, potassium, calcium) across the membrane, crucial for maintaining the membrane potential and signal transduction
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Facilitated diffusion aids in the removal of waste products from cells, such as the transport of urea out of liver cells
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The rate of facilitated diffusion is limited by the number of available carrier or channel proteins and their saturation at high substrate concentrations
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Saturation occurs when all the binding sites on the proteins are occupied, resulting in a maximum transport rate (Vmax) that cannot be exceeded even with further increases in substrate concentration
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Passive Diffusion vs Facilitated Transport

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Similarities

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Both passive diffusion and facilitated diffusion are forms of passive transport that move molecules down their concentration gradient
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Neither process requires the expenditure of cellular energy (ATP)
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The rate of transport for both mechanisms is influenced by the concentration gradient (a steeper gradient leads to faster transport)
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Differences

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Passive diffusion occurs directly through the phospholipid bilayer, while facilitated diffusion requires the assistance of membrane-bound carrier proteins or channel proteins
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Passive diffusion is limited to small, nonpolar molecules, whereas facilitated diffusion can transport larger, polar, or charged molecules
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The rate of passive diffusion is directly proportional to the concentration gradient, while the rate of facilitated diffusion is limited by the number and saturation of carrier or channel proteins
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Passive diffusion does not exhibit specificity for particular molecules, while facilitated diffusion is highly specific, with proteins transporting only certain molecules or ions
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Factors Influencing Diffusion Rates

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Concentration Gradient

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The concentration gradient is a primary factor influencing the rate of both passive diffusion and facilitated transport
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • A steeper concentration gradient (a larger difference in concentration between the two sides of the membrane) results in a higher rate of molecular movement
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • As the concentration gradient decreases, the rate of diffusion or transport slows down until equilibrium is reached
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Temperature

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Temperature affects the rate of passive diffusion and facilitated transport by influencing the kinetic energy of molecules
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Higher temperatures increase the kinetic energy of molecules, causing them to move faster and collide with the membrane more frequently
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Consequently, higher temperatures generally increase the rate of diffusion and transport
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Lower temperatures decrease kinetic energy and slow down the rate of diffusion and transport
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Membrane Permeability and Composition

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Membrane permeability, determined by the composition and structure of the phospholipid bilayer, influences the rate of passive diffusion
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • More permeable membranes allow for faster diffusion of molecules
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The presence of cholesterol in the membrane can reduce permeability by increasing the rigidity of the bilayer and hindering the movement of molecules
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The type and proportion of phospholipids in the membrane (such as the ratio of saturated to unsaturated fatty acids) can also affect permeability
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Molecular Properties

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The size, charge, and polarity of molecules affect their ability to pass through the cell membrane
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Small, nonpolar molecules (carbon dioxide, oxygen) diffuse more readily compared to large, polar, or charged molecules (glucose, amino acids, ions)
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Larger molecules experience more resistance when passing through the membrane due to their size and potential interactions with the hydrophobic core of the bilayer
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Charged molecules are repelled by the hydrophobic interior of the membrane and require carrier proteins or channel proteins for transport
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Protein Availability and Saturation (Facilitated Diffusion)

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • In facilitated transport, the number and availability of carrier or channel proteins determine the maximum rate of transport
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The presence of more proteins increases the transport capacity, allowing for a higher rate of facilitated diffusion
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Saturation of carrier proteins occurs when all the binding sites are occupied by substrate molecules, limiting the rate of transport at high substrate concentrations
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Once saturation is reached, further increases in substrate concentration do not result in an increased rate of transport, leading to a plateau in the transport rate
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Inhibitors and Competing Molecules (Facilitated Diffusion)

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • The presence of inhibitors or competing molecules can reduce the rate of facilitated transport by blocking or occupying the binding sites on carrier or channel proteins
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Competitive inhibitors are molecules that closely resemble the substrate and compete for the same binding sites on the proteins, reducing the transport of the desired substrate
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Non-competitive inhibitors bind to allosteric sites on the proteins, causing conformational changes that decrease the affinity for the substrate or prevent the transport process altogether
Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3

Top images from around the web for Passive Diffusion: Principles and Role

  • Passive transport - Wikipedia View original

    Is this image relevant?

  • Passive Transport | Biology for Majors I View original

    Is this image relevant?

  • Passive transport - Wikipedia View original

    Is this image relevant?

1 of 3
  • Example: Ouabain, a cardiac glycoside, inhibits the sodium-potassium pump (Na+/K+ ATPase) by binding to the potassium binding site, disrupting the normal transport of sodium and potassium ions across the membrane

Key Terms to Review (18)

Carrier proteins: Carrier proteins are specialized membrane proteins that facilitate the transport of specific substances across a cell membrane. Unlike channels that allow passive movement, carrier proteins undergo conformational changes to bind and transport molecules, ensuring that essential nutrients and ions enter or exit the cell efficiently.
Cellular Respiration: Cellular respiration is a metabolic process that converts biochemical energy from nutrients into adenosine triphosphate (ATP), and releases waste products. This process is essential for producing the energy required by cells to perform various functions, connecting closely with energy transfer, enzyme activity, membrane transport, and thermodynamics in biological systems.
Channel proteins: Channel proteins are specialized membrane proteins that facilitate the transport of ions and molecules across the cell membrane by forming pores or channels. These proteins are essential for various cellular processes, allowing specific substances to pass through the lipid bilayer in a controlled manner, and play a critical role in maintaining homeostasis by regulating the movement of ions and small molecules in and out of cells.
Concentration gradient: A concentration gradient refers to the difference in the concentration of a substance between two areas, typically across a membrane. This gradient is crucial in determining the movement of molecules in biological systems, influencing processes like passive diffusion and facilitated transport, where substances naturally move from areas of higher concentration to areas of lower concentration without the need for energy input.
Facilitated diffusion: Facilitated diffusion is a passive transport process that allows substances to cross membranes with the help of specific transport proteins, without the need for energy input. This mechanism is crucial for the movement of polar and charged molecules, which cannot easily diffuse through the lipid bilayer of cell membranes. It operates along the concentration gradient, ensuring that molecules move from areas of higher concentration to areas of lower concentration, while also being influenced by factors such as membrane potential and electrochemical gradients.
Fluorescence recovery after photobleaching: Fluorescence recovery after photobleaching (FRAP) is a technique used to study the dynamics of molecules within living cells by measuring the recovery of fluorescence in a bleached area over time. This method allows researchers to analyze how quickly and efficiently molecules can move into a region after a portion has been selectively destroyed using intense light. FRAP provides valuable insights into membrane dynamics, molecular interactions, and cellular transport mechanisms.
Membrane proteins: Membrane proteins are essential proteins that are embedded in or associated with biological membranes, playing critical roles in various cellular functions such as signaling, transport, and maintaining the structure of the membrane. These proteins can either span the entire membrane or be anchored to one side, influencing how cells interact with their environment and each other. They are crucial for processes like passive diffusion and facilitated transport, and understanding their structure and behavior is vital for advancements in biophysics and related fields.
Nutrient uptake: Nutrient uptake refers to the process by which cells absorb essential substances, such as minerals, vitamins, and other nutrients, from their surrounding environment. This process is critical for cellular function and growth, as it allows organisms to obtain the building blocks necessary for metabolism, energy production, and overall homeostasis. Different mechanisms, including passive diffusion and facilitated transport, govern how these nutrients are absorbed into cells.
Osmometry: Osmometry is the measurement of the osmotic pressure of solutions, which reflects the concentration of solute particles in a solvent. This technique is crucial for understanding how substances move across membranes via processes like passive diffusion and facilitated transport. It helps in determining how various solutes affect the osmotic balance, which is essential for maintaining cellular homeostasis and function.
Passive diffusion: Passive diffusion is the process by which molecules move across a biological membrane from an area of higher concentration to an area of lower concentration without the use of energy. This movement occurs spontaneously due to the inherent kinetic energy of molecules, and it plays a crucial role in cellular processes, allowing for the exchange of substances essential for life.
Passive vs Active Transport: Passive transport and active transport are two fundamental mechanisms by which substances move across cell membranes. Passive transport occurs without the need for cellular energy, allowing molecules to flow down their concentration gradient, while active transport requires energy input, often in the form of ATP, to move substances against their concentration gradient. Both processes are essential for maintaining cellular homeostasis and facilitating communication between cells.
Phospholipid bilayer: The phospholipid bilayer is a double layer of phospholipids that forms the fundamental structure of cell membranes, providing a semi-permeable barrier that separates the interior of the cell from the external environment. This unique arrangement allows for the selective transport of molecules, crucial for maintaining cellular homeostasis and facilitating processes like passive diffusion and facilitated transport.
Polar molecules: Polar molecules are molecules that have a net dipole moment due to the presence of polar bonds, where the electrons are not shared equally between atoms. This uneven sharing of electrons leads to regions of partial positive and negative charges within the molecule, causing it to exhibit unique properties such as solubility in water and reactivity with other polar substances.
Saturation Kinetics: Saturation kinetics refers to the phenomenon where the rate of a process, such as transport or enzymatic reaction, reaches a maximum velocity as the substrate concentration increases, leading to a plateau in the reaction rate. This occurs because all available binding sites are occupied, and further increases in substrate concentration do not result in a proportional increase in reaction rate. This concept is crucial for understanding how substances move across membranes and how enzymes function in biological systems.
Selective permeability: Selective permeability is the property of cell membranes that allows certain substances to pass through while blocking others. This characteristic is vital for maintaining homeostasis within the cell, as it enables the selective entry and exit of ions, nutrients, and waste products. It is largely dependent on the structure and function of membrane proteins, which facilitate or restrict transport mechanisms across the lipid bilayer.
Small nonpolar molecules: Small nonpolar molecules are chemical species that are generally hydrophobic and do not carry any significant electrical charge, allowing them to easily pass through lipid bilayers. These molecules, such as oxygen, carbon dioxide, and nitrogen, can move across cell membranes without the need for assistance due to their size and lack of polarity. Their properties play a crucial role in cellular processes, particularly in passive diffusion and facilitated transport mechanisms.
Transport maximum: Transport maximum refers to the maximum rate at which a substance can be transported across a cell membrane by specific transport proteins or carriers. This concept is crucial in understanding how substances are moved into and out of cells, especially when dealing with facilitated transport where carrier proteins assist in moving molecules that cannot easily diffuse through the lipid bilayer.
Uniport vs Symport: Uniport and symport are two types of transport mechanisms used by cells to move substances across their membranes. Uniport refers to the process of transporting a single type of molecule or ion across the membrane in one direction, while symport involves the simultaneous transport of two different molecules or ions in the same direction. Both mechanisms are crucial for maintaining cellular homeostasis and facilitating the movement of essential nutrients and ions.
© 2024 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.
Back
Practice QuizGlossary
Practice QuizGlossary
Next guide