Physiology An action potential is initiated at the Axon Hillock or Initial segment of the 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 sodium channels 💡 Explanation An action potential is initiated at the Axon Hillock or Initial segment of the neuron because ✓ Correct Answer: A. Threshold for Excitation is lowest