Which Statement Describes Type I Alveolar Cells

Question

Which statement describes 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.

Accepted Answer

Type I alveolar cells form the wall of the alveoli, making them important for gas exchange during respiration.

Answer: D
 Type II alveolar cells are responsible for the production and secretion of pulmonary surfactant, which is a substance that reduces surface tension within the alveoli.

Answer: B
 The contraction of smooth muscle cells in the bronchioles during expiration helps to force air out of the alveoli, not Type I alveolar cells.

Answer: C
 Type II alveolar cells are responsible for the production and secretion of pulmonary surfactant, which is a substance that reduces surface tension within the alveoli.