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The Loop of Henle, together with the vasa recta, is crucial for concentrating urine. Their close association and countercurrent flow contribute to a gradient of increasing osmolarity in the medullary interstitium, enabling human urine to be about four times more concentrated than the initial filtrate. How does the Loop of Henle contribute to this process?

1. The Loop of Henle does not contribute to urine concentration.
2. The Loop of Henle is involved in concentrating urine.
3. The Loop of Henle reduces the concentration of urine.
4. The Loop of Henle promotes urine dilution.

Correct answer: The Loop of Henle is involved in concentrating urine.

Solution

The Loop of Henle creates and maintains the high osmolarity of the medullary interstitium through countercurrent flow, which is essential for water reabsorption. That is why it helps concentrate urine rather than dilute it.

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