<prompt> Excitatory post synaptic potential is due toK influxNa effluxNa influxCa influx  <response>: EPSP Excitatory post synaptic potential -1. Definition: the increase in voltage above the normal resting potential that is to a less negative value is calledEPSP because if this potential rises high enough, it will elicit on action potential in the neuron, thus exciting it. EPSP is due to depolarization.2. Production à rapid influx of Na to the interior neutralised part of the negativity of RMP à RMP ed from - 65 to - 45 my à EPSP à excite the neuron. 