Which of the following ions has a higher intracellular concentration compared with the extracellular fluid?
ExplanationC. Potassium is the only one of the choices that has a higher intracellular concentration. The difference between potassium, sodium, and chloride concentrations sets up the electrochemical gradient, which helps drive the flow of ions for action potentials. The Na-K pump forces sodium out of the cell and potassium into the cell against concentration gradients and requires the use of adenosine triphosphate to perform this
