Biology for IGCSE & O level - Gas Exchange In Humans (Section 3 - No. 50)
Which of the following components of inhaled air is not found in significant quantities in exhaled air?
Oxygen
Carbon Dioxide
Water vapor
Nitrogen
Explanation
Oxygen is used in the blood to make energy. Carbon Dioxide is given off to the lungs as waste. Nitrogen and water vapor pass through without being used.
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