Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

What is the purpose of mucus in the trachea?

1. To regulate air pressure

2. To trap foreign particles

3. To lubricate the trachea

4. To enhance oxygen absorption

The correct answer is: To trap foreign particles

The purpose of mucus in the trachea is to trap foreign particles. The trachea, or windpipe, serves as an essential airway for respiratory function, and the lining of the trachea is coated with mucus-producing cells. This mucus plays a critical role in the respiratory system by trapping dust, allergens, bacteria, and other particulates that we inhale. By capturing these foreign particles, mucus prevents them from reaching the lower respiratory tract, reducing the risk of infections and maintaining clear airways for optimal breathing. Mucus also contains antibodies and enzymes that provide additional defense against pathogens, further supporting the body's immune response. In this context, the mucus acts as a protective barrier, ensuring that the respiratory system remains healthy and functional. The action of cilia, hair-like structures on the surface of respiratory epithelial cells, helps to move the trapped particles upwards, facilitating clearing from the airways.