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A-Level Biology OCR A

Surface Blood Skin Redirection Arterioles Constrict Arteriovenous Shunt

Vasoconstriction narrows arterioles near the skin surface and dilates shunt vessels, reducing blood flow to the skin to keep warm blood below the surface and minimize heat loss. Conversely, vasodilation widens skin arterioles and constricts shunt vessels, forcing blood to the surface for increased heat radiation or loss through conduction.

Vasoconstriction narrows arterioles near the skin surface and dilates shunt vessels, reducing blood flow to the skin to keep warm blood below the surface and minimize heat loss. Conversely, vasodilation widens skin arterioles and constricts shunt vessels, forcing blood to the surface for increased heat radiation or loss through conduction.

Front Explain in detail how the redirection of bloow flow through the skin occurs and its role in thermoregulation.
Back Redirection of blood flow:

Vasoconstriction
  • Arterioles near surface of skin constrict
  • Arteriovenous shunt vessels dilate - little blood flows thru capillary networks close to surface
  • Warm blood is kept well below surface so less radiation out


Vasodilation
  • Arterioles near surface of skin dilate
  • Arteriovenous shunt vessels constrict - blood forces through capillary networks close to surface
  • Warm blood is close to the surface - can radiate out more easily or get lost by conduction

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