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Best Answer: Well - the kidney is the organ that regulates the amount of water *leaving* your body. It is controlled by hormones from other parts of your body: the pituitary gland below the brain, the adrenal glands above the kidneys, the liver. Intake of water is done by drinking, and most of the water is absorbed in your large intestine. The state of being thirsty is hormonally controlled from the hypothalamus.
Describe the regulation of water output in humans. The majority of fluid output occurs from urination. Some fluid is lost through perspiration (part of the body's temperature control mechanism) and as water vapor in expired air. The body's homeostatic control mechanisms ensure that a balance between fluid gain and fluid loss is maintained.