<prompt> Highest equilibrium potential is that for:-NaKCI-Ca  <response>: - Ca2 equilibrium potential is 129 millivolts- Equilibrium potential is calculated by Nernst equation NERNST EQUATION: Electromotive force in millivolts- It is concentration of paicular Ion on either side of the membrane. For calcium- Ca2 concentration gradient from outside to inside C1 C2 is almost 10,000.- Intracellular Ca2 is very low, So Ca2 moves in very fast.- Ca2 is divalent cation, So it will carry double the number of positive charges to inside.- Therefore, when Ca2 reaches equilibrium, charge on the membrane will be very high. 129mv- highest of all the Ions in the body. For chloride- EP in nerve -70mv- EP in muscle -89mv RMP of muscle-90mv is closest to equilibrium potential of Cl-.- If membrane potential is very close to EP of any Ion then that Ion movement will not be that great- If membrane potential is far away from EP of any ion, then the ion movement will be much greater 