What are 5 important electrolytes?

• A. Magnesium, Sodium, Potassium, Calcium, Chloride
• B. Calcium, Phosphorus, Magnesium, Sodium, Potassium
• C. Sodium, Chloride, Potassium, Magnesium, Calcium
• D. Iron, Zinc, Copper, Magnesium, Calcium

Answer: (C)

Electrolytes are minerals that dissolve into ions in body fluids and are essential for fluid balance, nerve signals, and muscle function. The five main electrolytes typically emphasized are sodium and chloride, which work together to regulate extracellular fluid and osmolarity; potassium, the major intracellular cation that establishes the resting membrane potential and drives muscle and nerve activity; magnesium, a key cofactor for many enzymes and helps regulate neuromuscular function; and calcium, which is crucial for muscle contraction, neurotransmitter release, and bone health. This combination covers the primary ions that enable electrical signaling and fluid management in the body.

Other minerals listed in the alternatives, like iron, zinc, and copper, are important nutrients but are not considered primary electrolytes. Phosphate is an electrolyte in some contexts, but chloride, rather than phosphorus, is the essential accompanying anion in the commonly cited set, along with the main cations.