Electrolytes are important because they are what your cells, especially nerve, heart, muscle, use to maintain voltages across their cell membranes and to carry electrical impulses, nerve impulses, and muscle contractions, across themselves and to other cells. Your kidneys work to keep the electrolyte concentrations in your blood constant despite changes in your body. For example, when you exercise, heavily, you lose electrolytes in your sweat, particularly sodium and potassium. These electrolytes must be replaced to keep the electrolyte concentrations of your body fluids constant. Another example where electrolyte drinks are important is when infants/children have chronic vomiting or diarrhea,
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