Potassium activates many enzymatic reactions and is essential to a number of physiological processes, including: transmission of nerve impulses contraction of cardiac, smooth, and skeletal muscles gastric secretion renel function tissue synthesis and carbohydrate metabolism. Postassium is the major cation of intracellular fluid and is essential for maintenance of acid-alkalike balance, isotonicity, and electrodynamic characteristics of the cell. In addition, it works with sodium to maintain healthy water balance, heart rhythm, and nerve and muscle function.