What are electrolytes?

• A. Nutrients required for body temperature regulation
• B. Specialized tissues that conduct nerve impulses
• C. Compounds that provide energy for physical exertion
• D. Salts and other chemicals dissolved in body fluids

Answer: (D)

Electrolytes are salts and other charged substances dissolved in body fluids that enable electrical signaling and help regulate fluid balance, nerve impulses, and muscle contractions. This definition fits best because electrolytes are not energy sources or tissues, and they don’t directly regulate temperature. They are the charged particles your body uses to conduct electricity across cells, maintain hydration, and support heart and muscle function. In firefighting rehab, staying in balance is crucial after sweating, since loss of ions like sodium, potassium, and chloride can affect hydration, heart rhythm, and muscle performance. Examples include sodium, potassium, chloride, calcium, magnesium, and bicarbonate.