Which substance among the following is listed as an electrolyte important to consider?

• A. Chloride
• B. Bicarbonate
• C. Oxygen
• D. Glucose

Answer: (B)

Understanding electrolytes and their role in acid-base balance is the key idea here. An electrolyte is a charged particle in body fluids that helps conduct electricity and support fluid balance, nerve function, and pH control. Bicarbonate is the main buffering electrolyte in blood, forming the carbonic acid–bicarbonate system that keeps blood pH within a narrow range. In kidney failure, dialysis solutions use bicarbonate as a buffer to correct metabolic acidosis, so bicarbonate levels are routinely monitored and managed. Oxygen and glucose are not electrolytes, since they don’t exist as charged ions in solution. Chloride is an electrolyte too, but the emphasis here is on bicarbonate because of its central role in buffering and dialysate therapy.