BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Sodium, which is an osmotically active cation, is one of the most important electrolytes in the extracellular fluid. It is responsible for maintaining the extracellular fluid volume, and also for regulation of the membrane potential of cells.

Detailed explanation-2: -Sodium is the primary positively-charged ion in extracellular fluid. Sodium helps regulate fluid balance and plays important roles in nerve transmission, muscle contraction, and nutrient absorption and reabsorption.

Detailed explanation-3: -The major electrolytes: sodium, potassium, and chloride.

Detailed explanation-4: -Electrolytes are essential minerals-like sodium, calcium, and potassium-that are vital to many key functions in the body.