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Biology · May / June 2019 · Paper 11 · Question 20

5090Temperature control

By which mechanism would the body be able to lose most heat on a hot dry day, if the surrounding air temperature is higher than body temperature?

  1. ABlood vessels in the skin become narrower.
  2. BHair erector muscles relax so hairs lay flat.
  3. CShivering by body muscles ceases.
  4. DSweat glands become more active.

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Correct answer: D. Sweat glands become more active.

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