Antidiuretic hormone is released by the posterior pituitary in response to increased plasma osmolality.

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Antidiuretic hormone (ADH), also known as vasopressin, is released by the posterior pituitary gland in response to increased plasma osmolality or decreased blood volume. Its main function is to conserve water by reducing urine output. ADH acts on the kidneys and blood vessels to increase water reabsorption and decrease urine volume, thereby increasing plasma volume and decreasing plasma osmolality.

Antidiuretic Hormone Is Released by the Posterior Pituitary in Response