This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerve Physiology, Subject name: Physiology
Sodium channels are maximum in which part of neuron - 
Select and explain. 
A. Soma, B. Axon hillock, C. Dendrites, D. Axon
B: Axon hillock
Answer: B: Axon hillock 
Explanation: Ans. is 'b'i.e., Axon hillocko In a motor neuron, the axon hillock and the initial segment of axon have the lowest threshold for excitation. This is because they have a much higher density of voltage gated sodium channels.