Which structures secrete surfactant?
A)Type I alveolar cells
B)Type II alveolar cells
C)Alveolar macrophages
D)Stretch receptors

Question

Quizplus · Accepted Answer

Two major types of epithelial cells appear in the alveolus. Type I alveolar cells provide structure, and type II alveolar cells secrete surfactant, a lipoprotein that coats the inner surface of the alveolus and facilitates its expansion during inspiration, lowers alveolar surface tension at end expiration, and thereby prevents lung collapse. Neither alveolar macrophages nor stretch receptors secrete surfactant.

Which Structures Secrete Surfactant