Physiology Action potential is initiated at the axon hillock/initial segment of neuron because: A Threshold for excitation is lowest B Neurotransmitter is released at this site C It is an unmyelinated segment D Has lowest concentration of voltage gated Na+ channel 💡 Explanation Action potential is initiated at the axon hillock/initial segment of neuron because: ✓ Correct Answer: A. Threshold for excitation is lowest