The walls of the alveoli are composed of two types of cells, type I and type II. The function of type II is to ________.
A. secrete surfactant
B. trap dust and other debris
C. replace mucus in the alveoli
D. protect the lungs from bacterial invasion
Answer:A
The walls of the alveoli are composed of two types of cells, type I and type II. The function of type II is to ________.
A. secrete surfactant B. trap dust and other debris C. replace mucus in the alveoli D. protect the lungs from bacterial invasion