O-LevelBiologyTransport in Humans5090/11 · Oct/Nov 2016 · Q131 Mark

Which states the sequence of contractions in one heart beat?

Aleft atrium and left ventricle together, pause, right atrium and right ventricle together

Bleft atrium, left ventricle, right atrium, right ventricle, pause

Cright atrium and left atrium together, right ventricle and left ventricle together, pause

Dright atrium, right ventricle, left atrium, left ventricle, pause

✓ Correct answer

C: right atrium and left atrium together, right ventricle and left ventricle together, pause

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2016 Paper 1 Variant 1, question 13.

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