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Water is excreted by three routes from your body. Kidneys, skin, feces and lungs. Kidneys just can not excrete the solutes in powder form. They have to be dissolved in water. Skin can excrete lot of water in hot sunny day. May be up to one liter per hour. This water is used to keep your body cool. Feces carry some more or less water with them. That is the physical property of feces. Water loss from lungs also in inevitable. The exhaled air get saturated with water vapor due very large surface area of gaseous exchange.

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7y ago
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12y ago

Because that is how much liquid that t needs to excrete.

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Q: Why does the body need to excrete as much water as it brings in?
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ten ounces


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