Cutaneous blood vessels play an almost major role in heat transfer and perspiration. First, it is through the blood vessels that fluid is delivered to the cells. Therefore, the higher the temperature, the wider the vessels will become and the closer they will rise to the surface of the skin, bringing with them more fluid, which, naturally, will increase perspiration. Secondly, as mentioned above, when the temperature rises, the vessels expand and give off excess heat through the skin. When it gets colder, on the contrary, they narrow and “hide”, keeping warm.
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