ADH and Water Balance
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Antidiuretic hormone, released from the posterior pituitary, increases kidney water reabsorption by inserting aquaporin channels into kidney tubules, concentrating urine and raising blood pressure.
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Dehydration raises blood osmolarity, triggering hypothalamic osmoreceptors to increase ADH secretion.
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Insufficient ADH causes diabetes insipidus, marked by excess urine output, a distinct condition from diabetes mellitus.