Question

The flagella on you lung cells sweep foreign particles and mucus toward the mouth and nose

A) To help with gas exchange
B) To produce mucus
C) To sweep foreign particles and mucus toward the mouth and nose
D) To regulate blood flow in the lungs

Answer 1

The cilia in the lung cells sweep foreign particles and mucus toward the mouth and nose to remove them from the respiratory tract, which is their main function rather than aiding in gas exchange, mucus production, or blood flow regulation.

Step-by-step explanation:

The flagella on lung cells, more correctly known as cilia, play a critical role in the respiratory system by protecting the lungs from foreign particles and mucus. These microscopic, hair-like projections line the respiratory tract and are involved in a defensive mechanism known as the mucociliary escalator. The cilia work by secreting mucus which traps dust, germs, and other foreign particles. They then move in a wave-like motion to sweep the entrapped mucus and particles upward toward the throat, where they can be expelled from the body. If you have ever coughed up phlegm when sick, you have witnessed this defense mechanism in action. To answer the student's question directly, the flagella (cilia) on lung cells sweep foreign particles and mucus toward the mouth and nose to sweep foreign particles and mucus toward the mouth and nose (Option C), rather than assisting in gas exchange, producing mucus, or regulating blood flow in the lungs.