key term - Active Transport

Definition

This is a process by which cells move materials across their membranes against a concentration gradient, from an area of lower concentration to an area of higher concentration. This process requires energy, typically in form ATP (adenosine triphosphate).

Related terms

ATP (Adenosine Triphosphate):

This is often referred to as "molecular currency" for intracellular energy transfer; it transports chemical energy within cells for metabolism.

Endocytosis:

A type of active transport where cells absorb material from outside by engulfing it with their cell membrane.

Exocytosis:

Another type of active transport where cells expel waste materials or secretory products by vesicles fusing with plasma membrane and releasing their contents outside the cell.