In conditions of dietary potassium depletion, how does the kidney primarily reduce urinary K⁺ excretion?
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Correct answer: Decrease distal sodium delivery and reduce K⁺ channel abundance in principal cells
With low dietary potassium, distal sodium delivery is reduced and K⁺-secreting channels are downregulated in the distal nephron, decreasing K⁺ excretion to conserve potassium.
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