A-LevelBiologyTransport in mammals9700/12 · Feb/Mar 2023 · Q321 Mark

Heart surgery may cause a decrease in the transmission of impulses in the Purkyne tissue to the right side of the heart. What is a possible effect of this decrease?

AImpulses would be delayed by the atrioventricular node.

BThe muscle of the right ventricle would contract slightly more slowly than the muscle of the left ventricle.

CThe muscle of the right atrium would not contract as fully as the muscle of the left atrium.

DThe sinoatrial node would transmit fewer impulses.

✓ Correct answer

B: The muscle of the right ventricle would contract slightly more slowly than the muscle of the left ventricle.

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2023 Paper 1 Variant 2, question 32.

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