Biology for IGCSE & O level - Gas Exchange In Humans (Section 4 - No. 3)
What is a key difference in the composition of inhaled and exhaled air?
Exhaled air has more oxygen and less carbon dioxide.
Exhaled air has less oxygen and more carbon dioxide.
Exhaled air has the same oxygen but more carbon dioxide.
Exhaled air has less nitrogen and more carbon dioxide.
Explanation
Exhaled air has a lower concentration of oxygen and a higher concentration of carbon dioxide.
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