Mucous membrane

Definition

Mucous membranes are moist linings found in various body cavities and passages that open to the external environment. They play a crucial role in trapping pathogens and particulates, thus serving as a first line of defense.

5 Must Know Facts For Your Next Test

1. Mucous membranes contain goblet cells that produce mucus to trap pathogens.
2. They are found in the respiratory tract, gastrointestinal tract, and urogenital tract.
3. Mucus contains antimicrobial enzymes like lysozyme that help neutralize pathogens.
4. Cilia on mucous membranes in the respiratory tract move trapped particles out of the body.
5. Normal microbiota on mucous membranes can outcompete potential pathogens for resources.

Review Questions

• What is the primary function of mucous membranes?
• Where in the body can mucous membranes be found?
• How do cilia and mucus work together to protect the respiratory system?

Related terms

Goblet Cells: Cells within mucous membranes that secrete mucus.

Lysozyme: An enzyme found in mucus that breaks down bacterial cell walls.

Normal Microbiota: The community of beneficial microorganisms residing on mucous membranes and other surfaces of the body.