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

Question

Quizplus · Accepted Answer

The function of type II alveolar cells is to secrete surfactant, which reduces surface tension and prevents the collapse of alveoli during exhalation. Option A, B, and C are not the functions of type II alveolar cells.

The Walls of the Alveoli Are Composed of Two Types