Q:

One of the reasons that the mixture of gases in the air contained in the alveoli of the lungs, differs from atmospheric air is that alveolar air is:

waelhammad
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2022-10-19
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One of the reasons that the mixture of gases in the air contained in the alveoli of the lungs, differs from atmospheric air is that alveolar air is: 

  1. saturated with water vapour whereas atmospheric air is not.
  2. at a higher temperature than atmospheric air.
  3. at a higher pressure than atmospheric air.
  4. enriched with nitrogen as it diffuses into the alveoli from the blood.
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waelhammad
2022-10-19
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A: Alveolar air is saturated with water vapour and this has a partial pressure greater than the PP of water in atmospheric air. Alveolar air and atmospheric air are at the same pressure except when inhalation and exhalation is occurring, so if water is in greater proportion within the alveoli (than in the atmosphere), then the other gases must be in lesser proportion. 

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