Amount of urine is regulated by volume of blood and amount of antidiuretic hormone (ADH). Volume of blood is determined by presence or absence of extra water in the body. More blood volume will increase pressure in the glomerulus. It increases the amount of glomerular or nephric filtrate. ADH is not secreted. Dilute urine is allowed to pass through the kidneys. The amount of urine is higher than the normal. In case the body has no extra water or is deficient of water, lesser glomerular filtrate will be produced. ADH is secreted. It helps in withdrawing a good amount of water from urine. Therefore, only concentrated urine is passed out. Amount of urine is smaller than the normal.