A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2025 · Q351 Mark

The bar chart shows the mean thickness of the walls of the main chambers in a mammalian heart. [Bar chart showing mean wall thickness /mm for heart chambers P, Q, R, S] Which row correctly identifies the heart chambers?

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Aright atrium: R, left atrium: Q, right ventricle: S, left ventricle: P

Bright atrium: Q, left atrium: S, right ventricle: R, left ventricle: P

Cright atrium: R, left atrium: Q, right ventricle: P, left ventricle: S

Dright atrium: Q, left atrium: R, right ventricle: S, left ventricle: P

✓ Correct answer

D: right atrium: Q, left atrium: R, right ventricle: S, left ventricle: P

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2025 Paper 1 Variant 2, question 35.

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