Which statement is correct for Type I alveolar cells?
A)They form the wall of the alveoli.
B)They secrete pulmonary surfactant.
C) They contract during expiration to force air out of the alveoli.
D) They are responsible for surface tension.

Question

Quizplus · Accepted Answer

Type I alveolar cells form the wall of the alveoli and are responsible for gas exchange between the air in the alveoli and the blood in the capillaries. Type II alveolar cells secrete pulmonary surfactant to reduce surface tension and prevent collapse of the alveoli during expiration. Neither type of alveolar cell contract during normal breathing.

Which Statement Is Correct for Type I Alveolar Cells