A-LevelBiologyGas exchange9700/12 · Feb/Mar 2024 · Q371 Mark
Which statements about the function of tissues found in the human gas exchange system are correct? 1 Collagen in the bronchi prevents them collapsing. 2 Smooth muscle in the bronchioles can contract to increase the flow of air into the alveoli. 3 Elastic fibres in the alveoli stretch and recoil during breathing.
A1 and 2
B1 and 3
C2 and 3
D3 only
✓ Correct answer
D: 3 only
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