A-LevelBiologyGas exchange9700/12 · Feb/Mar 2022 · Q351 Mark
Which statement helps to explain why there is no cartilage in the walls of the bronchioles?
ACartilage would make the bronchioles too narrow.
BGases must diffuse across the walls of the bronchioles.
CSmooth muscle is sufficient to support the walls of the bronchioles.
DThe bronchiole walls do not need to change shape.
✓ Correct answer
C: Smooth muscle is sufficient to support the walls of the bronchioles.
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