<prompt> Which ion has the greatest concentration of saliva under resting conditions?NaKCl-HCO3-  <response>: Under resting conditions, the concentrations of sodium and chloride ions in the saliva are only about 15 mEqL each, about one-seventh to one-tenth their concentrations in plasma. Conversely, the concentration of potassium ions is about 30 mEqL, seven times as great as in plasma, and the concentration of bicarbonate ions is 50 to 70 mEqL, about two to three times that of plasma. 