Quiz: Defense Mechanisms of the Respiratory System
Question 1 of 3  

Particles such as dust, mold, bacteria, and viruses deposit on airway surfaces in the body. Fortunately, the respiratory system has defense mechanisms to clean and protect itself. Which of the following defense mechanisms are tiny, hair-like projections that move the mucus that lines the trachea upwards in the respiratory tract?

  • A.


  • B.


  • C.


  • D.

    Mucus layer

Am I correct?