Maintenance of urine output is a prerogative of the kidneys and the following are the mechanisms that are followed: - Antidiuretic Hormone (ADH): This hormone is secreted by the pituitary and it makes the kidneys take in more water which decreases the amount of water that is lost as urine. The more dehydrated the body becomes, the more is let out for the body to save water. - Aldosterone: An adrenal hormone that modulates the distribution of water and salt in the body. It stimulates sodium absorption in the kidney which influences urine production indirectly. - Blood Pressure and Osmolarity: There are receptors in the body that sense the pressure of blood and the solute concentration and the filtration and reabsorption of the kidney are adjusted such that the amount of urine output is regulated.