key term - Mucus

Definition

Mucus is a viscous secretion produced by mucous membranes. It plays a critical role in trapping and removing particles from the respiratory tract.

5 Must Know Facts For Your Next Test

1. Mucus contains glycoproteins, enzymes, and antibodies that help neutralize pathogens.
2. It is produced by goblet cells and submucosal glands in the respiratory tract.
3. Mucus helps to humidify inhaled air and trap dust, microbes, and other foreign particles.
4. Ciliary movement in the respiratory tract transports mucus towards the throat for expulsion or swallowing.
5. An overproduction of mucus can be symptomatic of respiratory infections such as bronchitis or chronic conditions like asthma.

Review Questions

Related terms

cilia:

Hair-like structures on epithelial cells that move mucus out of the lungs.

goblet cells: Specialized epithelial cells that secrete mucus.

phlegm: Thickened mucus produced during respiratory infections, often expectorated.