Antidnuretic Hormone (Gr. Anti - Against, Diuretic - Diuretic)

Antidiuretic hormone (ADH) is a hormone produced by the neurohypophysis (posterior lobe of the pituitary gland). The main function of ADH is the regulation of water-salt balance in the body by influencing the reabsorption (reabsorption) of water in the renal tubules.

When plasma osmolarity decreases, the neurohypophysis increases the secretion of ADH, which stimulates the reabsorption of water in the kidneys, thereby increasing osmolarity and circulating blood volume. With an increase in plasma osmolarity, on the contrary, the production of ADH decreases, which leads to a decrease in water reabsorption and an increase in diuresis.

Thus, ADH plays an important role in maintaining the body's water balance and osmolarity at a constant level. Disturbances in the ADH system lead to the development of diseases associated with the pathology of water-salt metabolism.