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Biology · Oct / Nov 2019 · Paper 12 · Question 20

5090Temperature control

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

  1. AArterioles supplying the skin have dilated.
  2. BCapillaries in the skin have moved closer to the surface.
  3. CThe person has started to sweat.
  4. DTemperature receptors have ceased to function.

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Correct answer: A. Arterioles supplying the skin have dilated.

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