Select the TRUE statements about pulmonary surfactants? (Select all that apply.)
a. They are secreted by alveolar cells
b. They lower the surface tension at the alveolar surface
c. They reduce airway resistance
d. They are made of lipids and proteins
Answer:
a. They are secreted by alveolar cells
b. They lower the surface tension at the alveolar surface
d. They are made of lipids and proteins
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