A-LevelBiologyGas exchange9700/12 · Oct/Nov 2025 · Q371 Mark

The photomicrograph shows the wall of a bronchus as seen with a light microscope. [Photomicrograph of the wall of a bronchus with labels X, Y, Z] Which row correctly identifies the structures labelled?

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AX: epithelium, Y: elastic fibres, Z: bronchiole

BX: endothelium, Y: smooth muscle, Z: bronchiole

CX: epithelium, Y: smooth muscle, Z: blood vessel

DX: endothelium, Y: elastic fibres, Z: blood vessel

✓ Correct answer

C: X: epithelium, Y: smooth muscle, Z: blood vessel

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2025 Paper 1 Variant 2, question 37.

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