What is the role of blood vessels in increasing heat loss ?
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When one is hot, arteries of the skin dilate to bring more blood to the body surface and dissipate body heat. We have a fixed volume of blood in the body (typically 4–6 liters), so circulating more blood through the skin requires that blood be redirected from somewhere else. Typically, that will come from the digestive tract (which gets a lot of our blood at rest), muscles, and kidney
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to pump blood
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