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Countercurrent multiplication is a mechanism in the kidneys that concentrates urine and conserves water. It involves the interaction between the descending and ascending limbs of the loop of Henle, where the flow of fluid in these segments runs in opposite directions. As water is reabsorbed from the descending limb, the ascending limb actively transports sodium and chloride ions out, creating a gradient of increasing osmolarity in the medulla. This process enhances the kidney's ability to produce concentrated urine, allowing for efficient water reabsorption.

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6d ago

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