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Question

The exchange of gases between the alveoli and blood in the lungs, as well as between blood and tissue, depends on


  1. partial pressure of the gases

  2. pressure and the diffusion capacity of the gases

  3. pressure of the gases

  4. diffusion capacity of the gases


Solution

The correct option is A

partial pressure of the gases


Partial pressure is the pressure exerted by each gas in a mixture of gases. It depends on the concentration of the gas in the mixture. Partial pressure of a particular gas in a mixture is higher if the concentration of that gas is more. Thus, the gases diffuse across the membrane from the region of their higher partial pressure to the region of their lower partial pressure.

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