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← Human Body & HealthWhich critical effect fails, related to fluid regulation, when ascending nephron loop damage disrupts the medullary gradient?
A)Decreased water reabsorption in the collecting duct✓
B)Increased sodium excretion by proximal tubule
C)Elevated creatine clearance at the glomerulus
D)Reduced potassium secretion by distal tubule
💡 Explanation
Reduced countercurrent multiplication impairs concentrated urine formation because the medullary osmotic gradient strength decreases; therefore, less water is reclaimed from the collecting duct, rather than altered sodium or potassium handling in other nephron segments under these specific loop failure conditions.
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