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[Influence of the potassium ion on function of the frog neuromuscular synapse].

Effects of different concentrations of potassium ions on function of motor neural endings were studied in the frog neuromuscular - muscular preparations. Quantitative relations between change of the muscle fibers' membrane rest potential and parameters of spontaneous or evoked release of transmitter, and the potassium ion concentration in the medium, were revealed. A positive specific effect of relatively low (about 8.7 mM) concentrations on the quantum composition of transsynaptic signals, was shown. The data obtained confirm the supposed participation of the potassium ions in reverse transsynaptic regulation of the neuromuscular - motor synapse function.