Difference between Ek and directly measured resting potential Ek Observed rp Mammalian skeletal muscle cell -95mV g0 mv Frog skeletal muscle cell 105mⅤ go mV Squid giant axon 96mⅤ -70 mvMammalian skeletal muscle cell -95 mV -90 mV Frog skeletal muscle cell -105 mV -90 mV Squid giant axon -96 mV -70 mV Ek Observed RP Difference between EK and directly measured resting potential