* Here the potassium and chloride symporter actually excretes the two ions into the lumen of the tubule
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* Na<sup>+</sup> / K<sup>+</sup> ATPases in the basolateral membrane move potassium into epithelial cells from the intercellular spaces in order to remove sodium. The potassium then diffuses into the lumen via channels
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* The ability to secrete potassium here is vital in animals with high potassium diets such as herbivores where excreting only the amount filtered would not be suffice
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====[[Collecting Duct - Anatomy & Physiology #Principal Cells| Principal Cells of Collecting Duct]]====
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* Potassium transported into lumen
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* Is both absorbed and secreted via paracellular route
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* Na<sup>+</sup> / K<sup>+</sup> ATPases in the basolateral membrane move potassium into epithelial cells from the intercellular spaces in order to remove sodium and keep potassium concentrations high.