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Simplified control circuit of human thermoregulation. [8]The core temperature of a human is regulated and stabilized primarily by the hypothalamus, a region of the brain linking the endocrine system to the nervous system, [9] and more specifically by the anterior hypothalamic nucleus and the adjacent preoptic area regions of the hypothalamus.
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On average, of those admitted to burn centers in the United States, 4% die, [4] with the outcome for individuals dependent on the extent of the burn injury. For example, admittees with burn areas less than 10% TBSA had a mortality rate of less than 1%, while admittees with over 90% TBSA had a mortality rate of 85%. [ 95 ]
There are two types of heat the body is adapted to, humid heat and dry heat, but the body adapts to both in similar ways. Humid heat is characterized by warmer temperatures with a high amount of water vapor in the air, while dry heat is characterized by warmer temperatures with little to no vapor, such as desert conditions.
An inability to use additional ways of keeping warm (e.g., drying their skin, putting on clothing, moving into warmer areas, or performing physical exercise) A nervous system that is not fully developed and does not respond quickly and/or properly to cold (e.g., by contracting blood vessels in and just below the skin: vasoconstriction ).
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The higher rate of heat transfer in water means that for an uninsulated person, the heat loss due to increased movement and the consequent increased convection, is not compensated by the additional metabolic heat output, and after a short period, a swimmer will lose heat more quickly than a person remaining still relative to the water.