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Question

Exchange of gases in alveoli occurs through _________ .


A
absorption
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B
dialysis
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C
diffusion
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D
anaerobic respiration
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Solution

The correct option is C diffusion
Diffusion is the movement of a substance from an area of higher concentration to an area of lower concentration. The air in alveoli contains higher concentration of oxygen. The alveoli are very close to capillaries, which has low oxygen concentration and high carbon dioxide as compared to alveolar air. Oxygen diffuses from the alveoli, into the blood in the capillaries. Similarly, carbon dioxide from the blood moves out of the capillaries into the alveoli.

Biology

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