He has written for Foreign Policy,The Guardian, Foreign Affairs, Politico and a host of other publications. The Interpreter Joins RFE/RL. We are proud to announce that, starting January 1, 2016, The Interpreter will be a special project of Radio Free Europe/Radio Liberty.
1 Sodium plays a large role in fluid balance, with different variations of sodium determining the shift of water by osmosis from one area of the body to another.  Along with chloride and bicarbonate, sodium is important for the proper regulation of the acid-base balance of the body.
The serum values and individual functions for these electrolytes are: 1  Calcium is the most abundant electrolyte in the body. 99 percent of calcium is stored in the teeth and bones where it helps to make and keep them strong. 2  Sodium is the major cation (positively charged ion) found outside the cell. It regulates the total amount of water in the body and plays a major role in neuronal and nerve signaling. Normal serum sodium values range from 135 to 145 milliequivalent/liter (mEq/L). Potassium is the major cation inside the cell.