[Relation between ouabain-insensitive differential sodium flux and sodium concentrations in solution]

The dependence of net sodium ion flux on the external sodium concentration was studied under the inhibition of the sodium pump. A steady state balance of sodium ion fluxes occurred at external sodium concentration differing from the calculated one, therefore the existence of a non-diffusion component of sodium ion flux was evident. It was shown that the non-diffusion ouabain-insensitive sodium ion flux consisted of the sodium efflux not connected with chlorine efflux or potassium influx, and the sodium influx connected, perhaps, with potassium efflux.