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: A. saturated with water vapour whereas atmospheric air is not. B. at a higher temperature than atmospheric air. C. at a higher pressure than atmospheric air. D. enriched with nitrogen as it diffuses into the alveoli from the blood.
Option A. The mixture of gases in the air contained in the alveoli of the lungs, differs from atmospheric air is that alveolar air is saturated with water vapour whereas atmospheric air is not.
