In humans,exchange of gases occurs

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(D) Alveoli are the primary site of exchange of gases.Exchange of gases also occurs between the blood and tissues.$O_{2}$ and $CO_{2}$ are exchanged a

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(D) Alveoli are the primary site of exchange of gases.Exchange of gases also occurs between the blood and tissues.$O_{2}$ and $CO_{2}$ are exchanged at these sites by simple diffusion,primarily based on the pressure/concentration gradient.The pressure/concentration gradient,solubility of gases,and the thickness of the membranes involved in diffusion are some important factors that affect the rate of diffusion.

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