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  • ÷−−− In physiology and medicine, dehydration is the excessive loss of body water, with an accompanying disruption of metabolic processes. It is literally the removal of water from an object; however, in physiological terms, it entails a deficiency of fluid within an organism. Dehydration of skin and mucous membranes can be called medical dryness. Dehydration occurs when water loss in the body exceeds the water intake. Most people can tolerate a three to four percent decrease in body water without difficulty. A five to eight percent decrease can cause fatigue and dizziness. Over ten percent can cause physical and mental deterioration, accompanied by severe thirst. A decrease more than fifteen to twenty-five percent of the body water is invariably fatal. Water goes out of the body in many ways, and they can be categorized into either “sensible” water loss or “insensible" water loss. “Sensible” water loss means it can be perceived by the senses. There are many forms of sensible water loss, such as feces secretion, sweating and vomiting. “Insensible" water loss cannot be perceived, for the water is lost without one being conscious of it. Insensible water loss is mainly through skin and respiratory tract. Wikipedia

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