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Your body gets to hot. If you don't drink ALOT of water, your body runs out of water VERY fast, if you don't drink water.
Answer:
During extreme heat the human brain that co-ordinates body temperature gets signals from the body to cool & supplies fluids through blood supply that drains out from the brain to dehydrating organ cells & tissues in the extreme heat.This is the reason for fainting. If the brain is kept at cooler temperature than the body then a person does not faint.
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