How Does Expired Air Differ From Inspired Air Qualitywise?

The air inside the lungs is never completely replaced. There is always a mixture of air left inside and the air inspired. The expired air differs from inspired air qualitywise in the following aspects:

  • It contains less oxygen
  • It contains more water vapour
  • It contains more carbon dioxide
  • It is warmer or at the same temperature as that of the body
  • It may contain some bacteria

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