Sodium and potassium are two major electrolytes.  Potassium is the major intracellular cation. Total body potassium content is approximately 50 mEq per kilogram body weight.  Potassium assists in muscle contraction and in maintaining fluid and electroltyte balance in body cells.  Potassium is also important in sending nerve impulses as well as releasing energy from protein, fat, and carbohydrates...