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

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

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