Urine volume and concentration is regulatedthrough the same processes that regulate blood volume. Antidiuretic hormone (ADH)—produced by the posterior pituitary gland —increases the amount of water reabsorbed in the distal convoluted tubule and collecting duct.
Vasopressin, also named antidiuretic hormone(ADH), arginine vasopressin (AVP) or argipressin,is a hormone synthesized as a peptide hormone in neurons in the hypothalamus, and is converted to AVP. It then travels down the axon of that cell, which terminates in the posterior pituitary