A) facilitating lung expansion
B) maintaining the stable size of the alveoli
C) to reduce the surface tension on the alveoli
D) all of the above
Correct Answer: D
Solution :
Surfactant is a lipoprotein secreted by surfactant secreting cells, which form a part of alveolar epithelium. This tends to reduce the surface tension of fluid, lining the alveoli and thus facilitates lung expansion and also maintains the stable size of the alveoli.
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