Select the correct statement about exchange of gases.

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Alveoli are the only sites in the human body where exchange of respiratory gases takes place

The rate of diffusion is directly proportional to the diffusion distance

The diffusing capacity of oxygen is greater than that of carbon dioxide

The greater the difference in partial pressure, the faster the rate of diffusion.

answer is D.

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Detailed Solution

A gas always diffuses the area where its partial pressure is greater to the area where its partial pressure is less. The greater the difference in partial pressure, the faster the rate of diffusion. Alveoli are the primary sites of exchange of gases. Exchange of gases also occur between blood and tissues. The diffusing capacity of carbon dioxide is 20-25 times that of oxygen due to its greater solubility. The rate of diffusion is inversely proportional to the diffusion distance (rate of diffusion is faster if the respiratory membrane is thinner).

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