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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.
Kidneys play a very large role in human osmoregulation by regulating the amount of water reabsorbed from glomerular filtrate in kidney tubules, which is controlled by hormones such as antidiuretic hormone (ADH), aldosterone, and angiotensin II.August 2014). Osmoregulation is the active regulation of the osmotic pressure of an organism 's fluids to maintain the homeostasis of the organism's water content; that is, it keeps the organism's fluids from becoming too diluted or too concentrated.