Vasopresiinia

Vasopresiinia, also known as antidiuretic hormone (ADH) or arginine vasopressin (AVP), is a peptide hormone produced by the hypothalamus and released by the posterior pituitary gland. Its primary function is to regulate water balance in the body by increasing the reabsorption of water in the kidneys. When the body is dehydrated or blood pressure is low, vasopresiinia is released into the bloodstream. It acts on the collecting ducts and distal tubules of the nephrons, increasing their permeability to water. This allows more water to be reabsorbed from the filtrate back into the blood, thus concentrating the urine and reducing water loss.

In addition to its antidiuretic effects, vasopresiinia also plays a role in maintaining blood pressure. At higher concentrations, it causes vasoconstriction, narrowing of blood vessels, which increases peripheral resistance and raises blood pressure. This action is particularly important during periods of significant blood loss or hypotension. Vasopresiinia also influences social behavior and bonding in some species, though its precise role in humans is still an area of research. Disruptions in vasopresiinia production or function can lead to conditions such as diabetes insipidus, characterized by excessive thirst and urination.