Water excretion in the kidneys is influenced by: 1- Proximal tubule 2- Vasopressin 3- Distal tubule 4- Ascending limb of loop of Henle 5- Integrity of collecting ducts Answer: 2- Vasopressin Regulation of water secretion is by the distal tubule and the collecting ducts under the influence of vasopressin. The relative hyperosmolality of the medulla is maintained by a counter-current mechanism and is responsible for the flux of water across the renal tubule.
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