[The "anomalous" relationship between the concentration of potassium in the medium and the membrane potential of muscle fibers with a decreased intracellular potassium concentration. III. Change in the membrane potential during prolonged muscle incubation in saccharose-sulfate media containing 2.5 or 75 mM of potassium].

At the external potassium concentration 2.5 mM, The value Em--Ek diminishes, but at 75 mM it increases, although the potassium fluxes are nearly balanced and nosignificant changes in internal potassium occur. The contribution of other ions to the electrogenesis is examined. An attempt is made to describe the movement of these ions by the Goldman equations. The permeability coeficients should have been much higher than potassium coefficient, and besides it should be admitted that the coefficients and the internal activity of ions discussed may vary with time.