Antidiuretic hormone (ADH) is a hormone produced by the pituitary gland. It plays a crucial role in maintaining the body’s water balance by controlling the amount of water reabsorbed by the kidneys.
Water reabsorption occurs along the nephron tubules in the kidneys. When the water content of the blood is too low, ADH is released by the pituitary gland, which makes the kidney’s nephron tubules more permeable to water, allowing them to absorb more water.
When the water content of the blood is too high, the pituitary gland stops releasing ADH which makes the nephron tubules less permeable to water.
|Blood Plasma Concentration||Problem||ADH Release||ADH Effects|
|High||Too little water||Increases||More water is reabsorbed by nephron tubules|
|Low||Too much water||Decreases||Less water reabsorbed by nephron tubules|
The control of water reabsorption by the kidneys’ nephron tubules is an example of negative feedback.