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Life Processes
Question
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In what way air breathed in differs from the air breathed out during respiration? How much water one loses daily from the body by breathing?

Answer

During respiration organisms use oxygen and give out CO2. Therefore, the air breathed in contains more percentage of oxygen and less percentage of carbon dioxide. The air breathed out contains more percentage of carbon dioxide and water vapour and less percentage of oxygen. A comparison of composition of air breathed in and breathed out is given in the table below:
Composition of Respired Air

Content

Air breathed in (Approx)

Air breathed out (Approx)

Nitrogen

79%

79%

Oxygen

21%

17%

Carbon dioxide

0.04%

4%

Water vapour

Varies

Saturated


One loses approximately 400 cm3 of water daily from the body by breathing.

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Some More Questions From Life Processes Chapter

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Name the life processes needed to maintain life.

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