A-LevelBiologyTransport in mammals9700/12 · May/June 2025 · Q331 Mark

Which statements about a mammalian heart are correct? 1 The right atrium and right ventricle contain deoxygenated blood going to the lungs. 2 The left atrium and left ventricle contain oxygenated blood going to the pulmonary circulation. 3 The left ventricle has a thicker wall than the right ventricle and delivers blood at higher pressure. 4 The pressure of blood in the aorta is less than that in the pulmonary artery.

A1, 3 and 4

B1 and 3 only

C2, 3 and 4

D2 and 4 only

✓ Correct answer

B: 1 and 3 only

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2025 Paper 1 Variant 2, question 33.

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