37 degrees C is the body's core temperature. At this temperature, the body works most effectively. Also, this is the ideal temperature for bacteria to develop in the body- both good and bad. The body regulates its temperature via the Hypothalamus, a part of the brain. Here, it regulates conditions for homeostasis the maintenance of a constant internal environment. Therefore, it is responsible for water loss etc.
If the body's core temperature drops below 37, symptoms of hypothermia set in. The lips and skin will be blue or pale. The body will shiver uncontrollably, in a rather desperate attempt to heat up. If the body's core temperature goes above 37 degrees, symptoms of heat stroke will set in. Both hypothermia and heat stroke can be fatal at 35 degrees and 39 degrees respectively.
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