Electrolytes for acid-base balance: 1 Bicarbonate; 2 Chloride; 3 Potassium; 4 Sodium. Which combination is correct?

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Bicarbonate provides the main extracellular buffering that directly neutralizes excess hydrogen ions, helping to maintain pH. Chloride works with bicarbonate to keep the system electrically balanced; changes in bicarbonate are often reflected by shifts in chloride to preserve electroneutrality, and this duo is central to how the body manages metabolic acid-base disturbances. Potassium plays a key role because hydrogen ion changes across cell membranes drive potassium shifts between the intracellular and extracellular compartments; acidemia tends to raise extracellular potassium, while alkalemia lowers it. Sodium, although essential for fluid balance and electrochemical stability, is not a direct buffer in acid-base regulation and is not typically listed among the core electrolytes handling acid-base balance. Together, bicarbonate, chloride, and potassium encompass the primary electrolytes involved in maintaining acid-base homeostasis.