How do the kidneys control the volume of water in our bodies?

ADH is anti diuretic hormone. Diuretic=something that makes you urinate more, so anti diuretic=causes less urination. When the volume of water in our blood is too low (the blood plasma is too concentrated,) the pituitary gland secretes MORE ADH into the bloodstream. This causes the kidneys to reabsorb MORE water and therefore the urine is more concetrated and less water is lost from the body. When the volume of water in our blood is too high (the blood plasma is too dilute,) the pituitary gland secretes LESS ADH into the bloodstream. When ADH reaches the kidneys, it causes the kidneys to reabsorb LESS water and therefore the urine produced is more dilute and more water leaves the body. This process is an example of negative feedback.