Is a neurohypophysial hormone found in most mammals.Its two primary functions are to retain water in the body and to constrict blood vessels.
Vasopressin, also known as arginine vasopressin (AVP), antidiuretic hormone (ADH), or argipressin, is a neurohypophysial hormone found in most mammals. Its two primary functions are to retain water in the body and to constrict blood vessels. Vasopressin regulates the body's retention of water by acting to increase water reabsorption in the kidney's collecting ducts, the tubules which receive the very dilute urine produced by the functional unit of the kidney, the nephrons. Antidiuretic hormone (ADH), also called arginine vasopressin (AVP), is a hormone that helps regulate water balance in the body by controlling the amount of water the kidneys reabsorb while they are filtering wastes out of the blood. This test measures the amount of ADH in the blood. ADH is produced by the hypothalamus in the brain and stored in the posterior pituitary gland at the base of the brain. ADH is normally released by the pituitary in response to sensors that detect an increase in blood osmolality (number of dissolved particles in the blood) or decrease in blood volume. Antidiuretic hormone (ADH): A relatively small (peptide) molecule that is released by the pituitary gland at the base of the brain after being made nearby (in the hypothalamus). ADH has an antidiuretic action that prevents the production of dilute urine (and so is antidiuretic).  Antidiuretic hormone A hormone produced by the pituitary gland that reduces the production of urine in the kidneys and therefore prevents water loss; also called 'vasopressin.'. Source(s): http://www.peteducation.com/dict_alpha_l... TourGuide · 7 years ago. Thumbs up. Its function is very simple. When the body is dehydrated it is released into the blood from the posterior pituitary and binds to its receptor in the kidney, acting to produce more water channels the the collecting duct of the kidney allowing for more water to reabsorbed, this also leads to more concentrated urine. Effects on the Kidney. The single most important effect of antidiuretic hormone is to conserve body water by reducing the loss of water in urine. A diuretic is an agent that increases the rate of urine formation. Antidiuretic hormone binds to receptors on cells in the collecting ducts of the kidney and promotes reabsorption of water back into the circulation. In the absense of antidiuretic hormone, the collecting ducts are virtually impermiable to water, and it flows out as urine. Vasopressin is a peptide hormone that increases water permeability of the kidney's collecting duct and distal convoluted tubule by inducing translocation of aquaporin-CD water channels in the plasma membrane of collecting duct cells. Vasopressin regulates the body's retention of water by acting to increase water reabsorption in the kidney's collecting ducts, the tubules which receive the very dilute urine produced by the functional unit of the kidney, the nephrons. ADH is also called arginine vasopressin. It is a water-regulating hormone made by the hypothalamus (in the brain), and stored in the posterior pituitary gland. ADH is the chemical that tells the kidneys how much water to conserve. ADH constantly regulates and balances the amount of water in the blood. ADH is a hormone that helps your kidneys manage the amount of water in your body. The test is seldom used alone, but is often combined with other tests to find out what is causing too much or too little of this hormone to be present Antidiuretic hormone, also called arginine vasopressin (AVP), is a hormone produced by the hypothalamus in the brain and stored in the posterior pituitary gland at the base of the brain. ADH helps regulate water balance in the body. 
https://en.wikipedia.org/wiki/Vasopressin https://labtestsonline.org/understanding/analytes/adh/tab/sample http://www.medicinenet.com/script/main/art.asp?articlekey=7000 https://au.answers.yahoo.com/question/index?qid=20090323045120AAke5oR http://arbl.cvmbs.colostate.edu/hbooks/pathphys/endocrine/hypopit/adh.html https://en.wikipedia.org/wiki/Vasopressin http://www.healthline.com/health/adh https://labtestsonline.org/understanding/analytes/adh/tab/test
what is antidiuretic hormone and its function