O-LevelBiologyCoordination & Response5090/12 · Oct/Nov 2016 · Q211 Mark

On a hot day, how does the skin react to lower the internal temperature of the body?

Aarterioles constrict, sweat production decreases, hairs stand on end

Barterioles constrict, sweat production increases, hairs lie flat against the skin

Carterioles dilate, sweat production decreases, hairs lie flat against the skin

Darterioles dilate, sweat production increases, hairs lie flat against the skin

✓ Correct answer

D: arterioles dilate, sweat production increases, hairs lie flat against the skin

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2016 Paper 1 Variant 2, question 21.

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