[Membrane potential at the low pH in neurons from the snail, Lymnaea stagnalis L].

In the snail, the pH 6.7-6.8 decreased the neuron membrane potential in 10% of cases and increased it in 30%. The hyperpolarisation was equal to 9(5 mV, the effect being abolished by addition of 5-10 M strophantidine. The findings suggest that low pH activates sodium conduction, the hyperpolarisation being caused by activation of the K+/Na(+)-pump.