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Question

Inspiration and expiration contain

A
Oxygen
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B
Oxygen and carbon dioxide
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C
Carbon dioxide
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D
None of these
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Solution

The correct option is B Oxygen and carbon dioxide
  • Inhaled air contains more oxygen used to create energy and less carbon dioxide.
  • Exhaled air contains more carbon dioxide produced as a waste product of energy production and less oxygen as it has been used in respiration. Gas exchange takes place by diffusion in the alveoli within the lungs.
  • As a result, the composition of inhaled and exhaled air is different.

Therefore, the correct answer is option B.

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