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Why do my ears get red hot and burn a bit sometimes? Vasodilation: The outer ear or pinna has a rich blood supply and sometimes, the nerves that dilate (expand) those blood vessels (branches of the vagus nerve) become activated and the blood vessels dilate and give a red color to the pinna and a warm feeling.
The hypothalamus is the temperature-regulating centre of the brain. It contains receptors which are sensitive to the temperature of the blood flowing through the brain. Temperature sensitive receptors in the skin also feed back information to the hypothalamus about the temperature of the skin surface.Changes in core body temperature cause the hypothalamus to send nerve impulses to the sweat glands, muscles and blood vessels to raise or lower the temperature.If the core temperature goes up the body loses heat to bring it down again.f the body is too hot... ...the blood vessels leading to the skin capillaries dilate, known as vasodilation. This allows lots of blood to flow near the surface and heat is lost through the skin by convection and radiation. The hairs of the body lie flat to avoid trapping an insulating layer of air.