What are the free-wandering phagocytic cells that ingest foreign material in the respiratory zone of the lungs?
a. Alveolar macrophages
b. Granular pneumocytes
c. Type I cells
d. Type II cells
ANS: A
Macrophages are another common cell found in the alveolar region. They can move from the pulmonary capillary circulation by squeezing through openings in the alveolar septa and then move out onto the alveolar surface. They are defensive cells that patrol the alveolar region and phagocytize foreign particles and cells (e.g., bacteria).
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Indicate whether the statement is true or false