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Human Anatomy and Physiology
Capillaries

How do the skin and capillaries work together to regulate body temperature?

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November 04, 2007 6:16PM

When you are hot, the capillaries near the surface of your skin open up to release heat from your body. When this happens you usually sweat as well to help cool off the skin. What is interesting is that this also happens when you are cold. It is called hyperemia. At first the capillaries constrict so that you don't loose body heat, but after a while your body dilates them in order to provide oxygenated blood to the skin.