2.89 describe the role of the skin in temperature regulation, with reference to sweating, vasoconstriction and vasodilation

When too cold (and need to warm) – VASOCONSTRICTION

  • Blood vessels near the surface of the skin constrict (tighten)
  • This is so that less heat can be transferred from the blood to surroundings
  • Shiver to generate heat
  • Little sweat is produced, as sweat cools you
  • Body hairs stand on end (perpendicular to your skin) – traps a layer of air which will act as an insulator.

 

When too hot (and need to cool) – VASODILATION

  • Blood vessels near the surface of the skin dilate (widen)
  • This is so that more blood can flow near the surface, allowing more heat to radiate into the surroundings
  • You produce sweat, and as it evaporates heat transfers from your skin to your surroundings.
  • Hairs lie flat to avoid trapping air for insulation
This a paper 2, triple science fact.
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