A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2020 · Q281 Mark

Which sequence of letters correctly identifies the order of events during the cardiac cycle? T atrial walls contract U impulse is delayed a fraction of a second V wave of excitation enters the atrioventricular node W wave of excitation passes down the Purkyne tissue X wave of excitation spreads from the sinoatrial node Y ventricles contract [Figure 28.1]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

A[Diagram option A]

B[Diagram option B]

C[Diagram option C]

D[Diagram option D]

✓ Correct answer

C: [Diagram option C]

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2020 Paper 1 Variant 2, question 28.

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