Part of that extra thickness is caused by the protein keratin, which is nourished in deeper layers of the skin but forms a surface layer of dead cells on the epidermis. This extra thickness may also explain why your hands and feet become wrinkled when you soak in the tub.
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 controls the volume of urine by regulating the amount of water absorbed into the convoluted tubules. . At some point ,change in blood level activates the osmoreceptors in the hypothalamus which in turn activates the release of antidiuretic hormone(ADH).