<prompt> Most abundant ion in intracellular fluid is:September 2008, September 2012, March 2013ProteinBicarbonatePotassiumSodium  <response>: Ans. C: PotassiumIntracellular component of the body water accounts for about 40 of body weight and extracellular component for about 20.Concentration of potassium in cytosol is 139 millimeter and of Amino acids in proteins is 138 millimeter, 