Part 6 · Endocrinology I — Pituitary, Water, Sodium and Adrenal
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AVP release responds to osmolality and major volume loss, then inserts collecting-duct aquaporin-2 through V2 receptors. AVP deficiency causes dilute polyuria; AVP resistance means kidney nonresponse; primary polydipsia suppresses AVP; SIAD retains water inappropriately.
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