<prompt> Why does initiation of nerve impulse occurs at the axon hillock?It is unmyelinatedDue to the release of neurotransmitterIt has a lower threshold than the rest of the axonNone of the above  <response>: In motor neurons, the poion of the cell with the lowest threshold for the production of a full fledged action potential is the initial segment, the poion of the axon at and just beyond the axon hillock. Ref: Ganongs Review of Medical Physiology, 23rd Edition, Chapter 4. 