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The Walls of the Alveoli Are Composed of Two Types

Question 57

Multiple Choice

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

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