Which type of lung cells secretes pulmonary surfactant?
a. Alveolar macrophages
b. Type I cells (pneumocytes)
c. Type II pneumocytes
d. Type III pneumocytes
ANS: C
Type II cells do not function as gas-exchange membranes like the type I cells. They manufacture surfactant, store it in vesicles called lamellated bodies, and secrete it onto the alveolar surface.
Health Professions
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