A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2018 · Q291 Mark

What describes the role of the atrio-ventricular node of the heart?

AIt causes the muscles of the ventricles to contract from the apex upwards.

BIt delays the transmission of a wave of electrical activity from the sinoatrial node.

CIt initiates a new wave of electrical activity in the ventricles.

DIt provides a non-conducting barrier between the atria and the ventricles.

✓ Correct answer

B: It delays the transmission of a wave of electrical activity from the sinoatrial node.

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2018 Paper 1 Variant 2, question 29.

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