The Lungs are Protected from Microorganisms By

Question

The lungs are protected from microorganisms by
A)the ciliated epithelial cells.
B)lysozyme in mucus.
C)phagocytic action of alveolar macrophages.
D)All of the choices are correct.

Accepted Answer

All of the choices are correct. The ciliated epithelial cells move mucus with trapped microorganisms toward the mouth for disposal. Lysozyme in mucus helps destroy microbes. Alveolar macrophages phagocytize invading microorganisms.