Originally posted 2014-08-21 05:16:40. Republished by Blog Post Promoter Potassium Potassium is a major intracellular electrolyte. About 98% of potassium is found inside the cells of the body while the remaining 2% is located extracellular and maintains neuromuscular irritability. Potassium is crucial to heart function and plays a key role in skeletal and smooth muscle...