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Question -

volume Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. Why ?



Answer -

Alveoli are the primary sites of exchange of gases. Alveolar region is having enough pressure gradient to facilitate diffusion of gases. Other regions of the respiratory sytsem don’t have the required pressure gradient. Additionally the membrane of alveoli is thin enough to facilitate exchange of gases in a convenient manner.

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