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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.
Water is a major component of every body cell, tissue, and organ. It plays an important role in almost every body function, including: Adequate hydration. Temperature regulation. Transportation of oxygen and nutrients through the blood. Acting as a necessary component of chemical reactions.