blood temperature is monitored by a centre in your brain called the hypothalamus.
in hot conditions, blood vessels in the skin dilate, allowing more bloody to flow through the skin capilleries. this means that more heat is lost from the surface of the skin by radiation. this is called vasodilation.
in cold conditions, blood vessels in the skin constrict, reducing the amount of blood that flows through the skin capilleries. this means that less heat is lost from the surface of the skin by radiation. this is called vasoconstriction.
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