[Study of the reversion potential for the slow component of the entering current in the membrane of mollusk neurons].

The nature of a significant deviation of the reversal potential for the slow inward current component from calcium equilibrium potential was investigated in the snail neuron somatic membrane. It is shown that this deviation may be due to a development of a non-specific outward current during large depolarizing shifts of the clamped membrane potential. The real equilibrium potential for calcium ions in nerve cells may be of about +200 mV.