 When these receptors detect a blood volume decrease in the atria, a signal is transmitted from the receptors to the hypothalamus in the brain.The hypothalamus, in turn, increases the production of vasopressin (ADH, AVP, or arginine vasopressin).These receptors also cause a renal vasodilation, resulting in increase of the water amount in the glomerular filtrate which, combined with the increased production of vasopressin by the hypothalamus, will cause water retention in urine.