Urine Concentration & Dilution
HardHigh-yieldPhysiology · Renal
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The kidney's ability to vary urine osmolality from ~50 mOsm/kg (maximally dilute) to ~1200 mOsm/kg (maximally concentrated) hinges on a hyperosmotic medullary interstitium and antidiuretic hormone (ADH). This single mechanism underlies the high-yield NEET PG correlations of SIADH versus diabetes insipidus. The healthy human kidney must excrete a daily solute load (~600 mOsm) in a variable water volume. To conserve…
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