O-LevelBiologyTransport in Humans5090/11 · May/June 2015 · Q141 Mark

The diagram shows changes in pressure in the aorta and the left ventricle during one complete heart beat. [Figure 14.1] What causes the increase in pressure between points X and Y?

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.

Acontraction of the left atrium

Bcontraction of the left ventricle

Crelaxation of the left atrium

Drelaxation of the left ventricle

✓ Correct answer

B: contraction of the left ventricle

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2015 Paper 1 Variant 1, question 14.

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