A-LevelBiologyTransport in mammals9700/12 · Feb/Mar 2019 · Q281 Mark

The photomicrograph shows a section through a structure found in mammals viewed using a light microscope. [Figure shows a cross-section of an artery or vein, labelled W points to the outer layer, x60 magnification] What are the main components of layer W?

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Acollagen fibres only

Belastic fibres and collagen fibres

Csmooth muscle and elastic fibres

Dsquamous epithelial cells forming an endothelium

✓ Correct answer

C: smooth muscle and elastic fibres

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2019 Paper 1 Variant 2, question 28.

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