The nephron loop is a countercurrent structure.

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The nephron loop, also known as the loop of Henle, is a countercurrent structure because the flow of filtrate and blood in the loop is in opposite directions, which maximizes the reabsorption of water and solutes from the filtrate into the surrounding blood vessels. This countercurrent exchange mechanism helps to create a concentration gradient in the renal medulla, which is important for the production of concentrated urine.

The Nephron Loop Is a Countercurrent Structure