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By Dr Ananya Mandal, MD. Electrolytes are essential substances in the body required for cell function and cell signalling. In the human body, the main electrolytes are: 1  Sodium (Na+). 2  Potassium (K+). 3  Calcium (Ca2+). 4  Magnesium (Mg2+). 5  Chloride (Clâ). 6  Hydrogen phosphate (HPO42â). 7  Hydrogen carbonate (HCO3â).
The serum electrolytes include: 1  Sodium (Na). 2  A positively charged electrolyte that helps to balance fluid levels in the body and facilitates neuromuscular functioning. 3  Potassium (K). 4  A main component of cellular fluid, this positive electrolyte helps to regulate neuromuscular function and osmotic pressure. 5  Calcium (Ca).he serum electrolytes include: 1  Sodium (Na). 2  A positively charged electrolyte that helps to balance fluid levels in the body and facilitates neuromuscular functioning. 3  Potassium (K). 4  A main component of cellular fluid, this positive electrolyte helps to regulate neuromuscular function and osmotic pressure. 5  Calcium (Ca).