What are the functions of electrolytes?

• A. Acid-base balance and nerve and muscle function
• B. Bone health and energy storage
• C. Oxygen transport
• D. Vitamin synthesis

Answer: (A)

Electrolytes are charged minerals that help keep fluid balance and acid-base status steady while also enabling the electrical activity that underlies nerve signaling and muscle contraction. They regulate how fluids are distributed between compartments, support proper membrane potentials, and participate in the transmission of nerve impulses and the contraction of muscles, including the heart. Sodium and chloride help with fluid balance and buffering, potassium is crucial for resting and action potentials inside cells, and calcium and magnesium influence neurotransmitter release and muscle contraction. Maintaining acid-base balance relies on buffers like bicarbonate in combination with other electrolytes to keep blood pH within a narrow range, which in turn preserves enzyme function and overall cellular activity. These intertwined roles—acid-base control and the electrical activity driving nerves and muscles—best capture the central functions of electrolytes. Other options describe areas not primarily governed by electrolytes, such as bone health or energy storage, which involve different minerals and metabolic pathways; oxygen transport is mainly about hemoglobin, and vitamin synthesis is not an electrolyte function.