As you move and your muscles begin to use energy, you begin to produce heat as a result of that energy. We all know that if we are doing something physical we begin to get warmer. Your body needs to dissipate the heat produced by the muscles in order to keep your internal temperature stable.
As you warm up, the blood vessels become closer to the skin surface. The vessels dilate and there is increased blood flow to the surface. This releases heat through the skin and the internal temperature is maintained.
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