Mucus

Definition

Mucus is a viscous secretion produced by mucous membranes that serves as a protective barrier and trap for pathogens. It plays a critical role in the immune responses of the respiratory, digestive, and other systems.

5 Must Know Facts For Your Next Test

1. Mucus contains antimicrobial peptides and enzymes like lysozyme that help neutralize pathogens.
2. In the gastrointestinal tract, mucus protects epithelial cells from digestive acids and enzymes.
3. Mucus traps bacteria and other foreign particles, preventing them from penetrating underlying tissues.
4. The production of mucus can be influenced by immune responses, such as during an infection or inflammation.
5. Goblet cells in the epithelial lining are primarily responsible for mucus production.

Review Questions

• What are the primary components of mucus that contribute to its antimicrobial properties?
• How does mucus function in protecting the gastrointestinal tract?
• Which type of cell is mainly responsible for producing mucus?

Related terms

Lysozyme:

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

Goblet Cells:

Specialized epithelial cells that secrete mucus.

Antimicrobial Peptides:

Small proteins found in mucus that have broad-spectrum antimicrobial activity.