At chemical synapses, most of the synaptic delay (the time between the arrival of a presynaptic action potential and the appearance of a postsynaptic EPSP or IPSP) is attributable to the:

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

answer; nociceptive pain;