The equilibrium potential for an ion species may be defined asthat potential required to keep the ions at a given concentrationand may be calculated from the nernst equation for that ionspecies. The concentration of K+ inside a squid axon is 400 mM andthe external concentration is 10 mM. The equilibrium potential forK+ at room temperature is: (log 0.025 = 1.60).
a) 73 mV
b) -73 mV
c) -23 mV
d) -93 mV
e ) 0.0 mV