....... are the primary sites of exchange of | vedclass

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(A) The $Alveoli$ are the primary sites of exchange of gases in the human respiratory system.These are thin-walled,bag-like structures at the end of t

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Alveoli

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(A) The $Alveoli$ are the primary sites of exchange of gases in the human respiratory system.These are thin-walled,bag-like structures at the end of the bronchioles.Oxygen diffuses from the $Alveoli$ into the blood,and carbon dioxide diffuses from the blood into the $Alveoli$ due to partial pressure gradients.

....... are the primary sites of exchange of gases.

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