When the human body is exposed to very hot conditions one result can be heatstroke. This is often the case for athletes and people who work outdoor during the hot season.
Heatstroke is a sudden, uncontrolled rise in body temperature. It is reaction that results from the body not being able to replace fluid lose through perspiration. If the lost fluids are not replaced then dehydration occurs and this leads to a decrease in the blood.
In this situation the body must decide whether to give the blood to the main organs (liver, kidneys , brain, and so on) or to the skin. Because the main organs are more important, they will receive the blood. Also, as a consequence of the drops in fluids, the body loses its ability to sweat. The situation becomes critical. The body now cannot produce sweat; therefore it cannot cool itself. Excess heat cannot be released through the skin as a result of the loss of blood supply to that part of the body. The lack of blood supply and the inability to sweat together cause the body to overheat.
Heatstroke can cause permanent injury if not treated properly. It is one way of how the body can react to heat
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