O-LevelBiologyCoordination & Response5090/12 · Oct/Nov 2019 · Q201 Mark

On a hot day, the cheeks of a light-skinned person may appear red in colour. What is the cause of this?

AArterioles supplying the skin have dilated.

BCapillaries in the skin have moved closer to the surface.

CThe person has started to sweat.

DTemperature receptors have ceased to function.

✓ Correct answer

A: Arterioles supplying the skin have dilated.

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2019 Paper 1 Variant 2, question 20.

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