The concentrations of which two ions are highest outside the cell? Top 1000 Questions The concentrations of which two ions are highest outside the cell?View Available Hint(s)a. K+ and protein anions (A−)b. Na+ and protein anions (A−)c.Na+ and Cl−d. K+ and Cl−Answer: Na+ and Cl− Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+