O-LevelBiologyTransport in Humans5090/11 · May/June 2021 · Q141 Mark

The diagram shows a section through the human heart. What will be the state of the valves when the walls of chambers X and Y are contracting? [Figure 6.1]

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Avalves 1 closed, 2 open, 3 open, 4 closed

Bvalves 1 closed, 2 open, 3 closed, 4 open

Cvalves 1 open, 2 closed, 3 open, 4 closed

Dvalves 1 open, 2 closed, 3 closed, 4 open

✓ Correct answer

A: valves 1 closed, 2 open, 3 open, 4 closed

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2021 Paper 1 Variant 1, question 14.

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