It achieves its principal function by promoting the release of aquaporins and, like aldosterone, increase in its production is caused by angiotensin II.
Corticosterone, in addition to regulating CRF, is the best-understood regulator of this hormone. The presence of the 1a class of receptors for this hormone in the brain has been linked to social recognition and affiliative behavior, while that of the 1b class is associated with aggression. It achieves its principal function by promoting the release of aquaporins and, like aldosterone, increase in its production is caused by angiotensin II. It is primarily produced in the supraoptic nucleus and, like the structurally similar oxytocin, released from the hypothalamus via the posterior pituitary gland. For 10 points, name this hormone, which constricts blood vessels and restricts water loss in the kidneys. 
Corticosterone, in addition to regulating CRF, is the best-understood regulator of this hormone.
Antidiuretic Hormone [or ADH or Arginine Vasopressin or Argipressin] 