Breathing and Exchange of GasesHard

Question

In alveoli of the lungs, the air at the site of gas exchange, is separated from the blood by

Options

A.alveolar epithelium only
B.alveolar epithelium and capillary endothelium
C.alveolar epithelium, capillary endothelium and tunica adventitia
D.alveolar epithelium, capillary endothelium, a thin layer of tunica media and tunica adventitia

Solution

The wall of the capillaries consists of only tunica internae which is made up of simple squamous endothelium. The wall of alveoli is also very thin, consisting of squamous epithelium.

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