Potassium:
Potassium is an essential mineral needed to regulate water balance, levels of acidity and blood pressure. Potassium, together with sodium-potassium inside the cell and sodium in the fluid surrounding the cell, work together for the nervous system to transmit messages as well as regulating the contraction of muscles.
People with low blood levels of potassium who are undergoing heart surgery are at an increased risk of developing heart arrhythmias and an increased need for cardiopulmonary resuscitation. Potassium is also required for carbohydrate and protein metabolism.