| Abstract: | An equation of the membrane potential (MP) was developed for a model of sodium pump when it was assumed that a macromolecule-carrier operated on the interior boundary of the membrane exchaning Na+i for K+ of membrane. These ions then moved downhill the electrochemical gradient inside the membrane. There are factors in the equation which indicate energetical consumtions for the ionic exchange. In was shown that an exchange of 3Na+ for 2K+ required 9,0 kkal/mole. The equation satisfactorily describes experimental values of MP during the electrogenic active transport. After all it was shown that an alteration of MP for 100 mV did not affect the operation of sodium pump i.e. the influence of outer electrical field was not detected. |
