O-LevelBiologyTransport in Humans5090/12 · Oct/Nov 2016 · Q151 Mark

The diagram shows an external view of the heart. [Diagram for Q15] The left coronary artery is blocked at the point labelled X. How would the blockage first affect the heart?

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ABlood is prevented from entering the heart.

BCells in the wall of the left ventricle die.

CThe rate of contraction of the heart increases.

DThe valves of the heart allow blood to flow backwards.

✓ Correct answer

B: Cells in the wall of the left ventricle die.

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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 2, question 15.

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