Due to the electrostatic and chemical properties, K+ ions are larger than Na+ ions, and ion channels and pumps in cell membranes can differentiate between the two ions, actively pumping or passively passing one of the two ions while blocking the other. hormone secretion and action vascular tone systemic blood pressure control gastrointestinal motility acid–base homeostasis glucose and insulin metabolism mineralocorticoid action renal concentrating ability fluid and electrolyte balance Potassium homeostasis denotes the maintenance of the total body potassium content, plasma potassium level, and the ratio of the intracellular to extracellular potassium concentrations within narrow limits, in the face of pulsatile intake (meals), obligatory renal excretion, and shifts between intracellular and extracellular compartments.
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