O-LevelBiologyTransport in Humans5090/11 · May/June 2016 · Q151 Mark

The graph shows pressure changes in the left atrium and in the left ventricle during one heartbeat. [Figure 15.1] What is the state of the valves in the heart at time X?

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Aleft atrio-ventricular valve (bicuspid): closed, semi-lunar valve (in aorta): closed

Bleft atrio-ventricular valve (bicuspid): closed, semi-lunar valve (in aorta): open

Cleft atrio-ventricular valve (bicuspid): open, semi-lunar valve (in aorta): closed

Dleft atrio-ventricular valve (bicuspid): open, semi-lunar valve (in aorta): open

✓ Correct answer

B: left atrio-ventricular valve (bicuspid): closed, semi-lunar valve (in aorta): open

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2016 Paper 1 Variant 1, question 15.

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