Biology for IGCSE & O level - Gas Exchange In Humans (Section 1 - No. 7)
Which of the following best describes the difference in composition of inspired and expired air?
Inspired air has more carbon dioxide and less oxygen than expired air.
Inspired air has less carbon dioxide and more oxygen than expired air.
Inspired and expired air have the same composition.
Inspired air has more nitrogen and less water vapor than expired air.
Explanation
During gas exchange, oxygen is removed and carbon dioxide is added, resulting in the observed differences.
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