A-LevelBiologyGas exchange9700/12 · Feb/Mar 2016 · Q341 Mark
The photomicrograph shows a section through part of a bronchus wall. What is the function of the tissue labelled X? [Figure 34.1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Acontracts to constrict the airway
Bhelps to widen the airway when at high altitudes
Cproduces mucus to trap dust particles and bacteria
Dsupports the airway to prevent collapse
✓ Correct answer
D: supports the airway to prevent collapse
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