what is a major function of potassium ions in the body?
Following is a list of some of the more important ions in the cells and fluids of our bodies: 1  Sodium ions are the principal cations found outside cells in the body. They help regulate and control the level of body fluids. 2  Potassium ions are the principal cations found inside cells in the body. Bananas, orange juice, and potatoes are good sources of Potassium ions help regulate cellular functions, including nerve impulses and heartbeats, and the level of body fluids. Chloride ions are the principal anions found outside cells in the body.