Q: Where does the countercurrent multiplier mechanism occur in the nephron?  

Answer: B

The countercurrent multiplier mechanism is an important process that occurs in the Loop of Henle of the nephron. This process is responsible for establishing and maintaining a concentration gradient of solutes in the interstitial fluid of the renal medulla. The descending limb of the Loop of Henle is permeable to water but not to solutes, so water moves out of the descending limb and into the more concentrated interstitial fluid. In contrast, the ascending limb of the Loop of Henle is permeable to solutes but not to water, so solutes move out of the ascending limb and into the less concentrated interstitial fluid. This creates a concentration gradient that allows for the reabsorption of water from the collecting ducts, resulting in the production of concentrated urine.

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