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

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

AIPMTAIPMT 1997Breathing and Exchange of Gases

Solution:

Alveoli are the site of respiratory exchange of gases. Oxygen from the alveolar air diffuses through the alveolar epithelium and the capillary endothelium into the capillary blood, and carbon dioxide diffuses in the opposite direction.