Electrolytes are charged ions that help regulate nerve function, muscle contraction, and fluid balance in the body. Calcium ions (Ca²⁺) are an important electrolyte found in the blood and play a crucial role in muscle contraction, blood clotting, and nerve signaling. Water is not an electrolyte because it does not carry a charge. Iodine is a trace element but not a primary blood electrolyte. Lactase is an enzyme involved in digestion, not an electrolyte. The NEX Science section often includes questions related to human physiology and emphasizes understanding ions and their roles in body function.
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