A-LevelBiologyGas exchange9700/12 · May/June 2025 · Q361 Mark
Which factors maintain the diffusion gradient for carbon dioxide at the surface of the alveoli? 1 blood flow around the alveoli 2 breathing movement exchanging air in the lungs 3 thin epithelial lining of the alveoli
A1 and 2
B1 and 3
C1 only
D2 and 3
✓ Correct answer
A: 1 and 2
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