How does urine concentrated in nephron.

1.	How does urine concentrated in nephron.
Answer» In the presence of ADH, the medullary collecting ducts become freely permeable to solute and water. As a consequence, the fluid entering the ducts (en route to the\xa0renal\xa0pelvis and subsequent elimination) acquires the\xa0concentration\xa0of the interstitial fluid of the medulla; i.e., the\xa0urine\xa0becomes concentrated

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