O-LevelBiologyTransport in Humans5090/11 · Oct/Nov 2021 · Q151 Mark

The diagram shows the pressures in the left side of the heart during one heartbeat. [Figure 15] Which valves are open and which are closed at the time marked X?

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Abicuspid: closed, semi-lunar: closed

Bbicuspid: closed, semi-lunar: open

Cbicuspid: open, semi-lunar: closed

Dbicuspid: open, semi-lunar: open

✓ Correct answer

A: bicuspid: closed, semi-lunar: closed

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2021 Paper 1 Variant 1, question 15.

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