<prompt> Nernsts potential of K:-61-10-90-94  <response>: Ans. C. - 90. Ref. Guyton 11thpg. 565; Ganong 23rdpg. 7-8. Table 1-1. Nernst potentialsfor K is ?90 mv; for Na is 60 mv, and for Cl? is ?70 mv.Nernsts potential In the resting state, the membrane is primarily permeable to K and, therefore, the resting membrane potential is close to the equilibrium potential for K. A potential that exactly opposes movement of an ion is called the Nernst potential for that ion; the equation for this is the following :EMF mV -61.5 x log .where EMF is the Nernst potential in millivolts on the inside of the membrane. The resting membrane potential is calculated with the Goldman equation.IonConcentration mmolL of H2O Inside CellOutside CellEquilibrium Potential mVNa15.0150.060K150.05.5-90CI-9.0125.0-70Concentration of Some Ions Inside and Outside Mammalian Spinal Motor Neurons. 