Macrophages termed "dust cells" are particularly prominent in which portion of the respiratory system?
a. Extrapulmonary bronchi
b. Lamina propria of the trachea
c. Pharyngeal tonsils
d. Pulmonary alveoli
e. Pulmonary bronchioles
ANS: D
Macrophages within pulmonary alveoli phagocytize bacteria and debris that are inhaled from the air.
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