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Question

Long loops of Henle correlate with


A
More concentrated urine
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B
More dilute urine
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C
Urine hypotonic to the blood
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D
Urine isotonic to the blood
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Solution

The correct option is C More concentrated urine
The loop of Henle is the portion of a nephron that leads from the proximal convoluted tubule to the distal convoluted tubule. Named after its discoverer, Jakob Henle, the loop of Henle's main function is to create a concentration gradient in the medulla of the kidney. By means of a countercurrent multiplier system, which utilizes electrolyte pumps, the loop of Henle creates an area of high urea concentration deep in the medulla, near the papillary duct in the collecting duct system. Water present in the filtrate in the papillary duct flows through aquaporin channels out of the duct, moving passively down its concentration gradient. This process reabsorbs water and creates a concentrated urine for excretion. Thus, option A is correct.

Biology

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