Which transporter in the thick ascending limb of the loop of Henle is most critical for reabsorption of sodium, potassium, and chloride?
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Correct answer: Na-K-2Cl cotransporter (NKCC2)
The NKCC2 cotransporter in the thick ascending limb reabsorbs Na⁺, K⁺, and Cl⁻, and is essential for sodium reabsorption in this segment.
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