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In alveoli of the lungs the air at the s...

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

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 adventiti

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The correct Answer is:
B
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