A-LevelBiologyGas exchange9700/12 · May/June 2014 · Q301 Mark
In the lungs, oxygen and carbon dioxide pass through cell membranes by diffusion. Which row is correct?
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Aoxygen from air: 3, carbon dioxide to air: 2
Boxygen from air: 3, carbon dioxide to air: 2 or 3
Coxygen from air: 5, carbon dioxide to air: 4
Doxygen from air: 5, carbon dioxide to air: 4 or 5
✓ Correct answer
D: oxygen from air: 5, carbon dioxide to air: 4 or 5
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