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Temperature Control by Means of the Blood

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    Collette M.
    US
    Collette M.

    The blood has to be warmed as it returns to the heart.

    Brian W.
    GB
    Brian W.

    Heat is produced by muscular construction, if to much heat is produced it must be removed from the body so a healthy condition can be maintained. The water in the blood has a great heat carrying capacity, The superficial capillary's in the subcutaneous layer of the skin that are close to the surface, when blood passes through these some of the heat radiates to the surface of the skin the sweat glands take water from the blood and secrete it onto the skin where the heat evaporates. If the body becomes cold the heat loss must be reduced, at this point the superficial capillaries can be closed down, keeping the heat in. The body's core temperature must be maintained at a temperature that is within very narrow limits, this is controlled by the detectors in the hypothalamus which is in the forebrain steam, the detectors also monitor the blood flowing through the brain. The cardiovascular system has a counter currant mechanism, the venous blood returning to the trunk is warmed by the arterial blood flowing in the opposite direction. As we breath in through the nose the air is warmed by arteries with in the nasal chambers. The brain and the liver have a high metabolic rate producing excessive heat, part of the blood supply to them is designed to remove excess heat. Redness at the sight of an injury or infection is called erythema and indicates that extra blood and heat are at the sight for healing purposes.

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