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Human Body
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Even at normal body temperature water is lost continuously through the skin as insensible perspiration which evaporates as quickly as it is formed. At environment temperature, above 90° F, the sensible perspiration appears as visible drops of moisture on the skin. Temperature Regulation
Control of body temerature is very finely balanced in all warm-blooded mammals and it is maintained at an average of 97° C (98.6° F). The body temperature is continuously monitored by the hypothalamus. Thermal receptors in the skin relay information about changes in the temperature of environment to the brain. Various mechanisms keep the body temperature relatively constant even though the skin itself may be quite cool. Skin plays a key role in body-temperature regulation. Heat is lost from the skin surface by radiation, convection and evaporation of sweat. The continuous secretion of perspiration carries off substantial amounts of heat.
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