Biology for IGCSE & O level - Gas Exchange In Humans (Section 1 - No. 31)
Which of the following is an accurate statement about the composition of exhaled air?
Contains more carbon dioxide than inhaled air.
Contains less oxygen than inhaled air.
Contains less water vapor than inhaled air.
Contains more nitrogen than inhaled air.
Explanation
Exhaled air has less oxygen and more carbon dioxide and water vapour.
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