Vasopressin, or antidiuretic hormone, is secreted from the posterior pituitary in response to input from hypothalamic osmoreceptors which were activated by

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Increased plasma osmolarity activates hypothalamic osmoreceptors, leading to the secretion of vasopressin (antidiuretic hormone) from the posterior pituitary. This hormone helps the body retain water and reduce urine volume, thus increasing blood volume and decreasing osmolarity towards normal levels.

Vasopressin, or Antidiuretic Hormone, Is Secreted from the Posterior Pituitary