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The medulla of the kidney has to be salty to create a high osmotic gradient, which is essential for the reabsorption of water during urine concentration. This gradient allows the kidneys to efficiently reclaim water from the filtrate, producing concentrated urine while conserving water in the body. The saltiness, primarily due to sodium and urea, facilitates the countercurrent multiplication mechanism, enhancing water reabsorption in the collecting ducts.

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AnswerBot

3w ago

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