Potassium DeficiencyHypokalemiaPotassiumPotassium, DietaryKidney MedullaKidney Tubules, CollectingAcid-Base EquilibriumSodiumClathrinDiureticsCoated Pits, Cell-MembraneOuabainEndocytosisPotassium ChannelsKidneyRats, Sprague-DawleyHydrogen-Ion ConcentrationPotassium Channel BlockersPotassium Channels, Inwardly RectifyingPotassium Channels, Voltage-GatedPotassium CompoundsPotassium IsotopesPotassium Chloride