This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
Na+ channel concentration is highest at 
Select and explain. 
A. Dendrites, B. Soma, C. Axon hillock, D. Axon
C: Axon hillock
Answer: C: Axon hillock 
Explanation: Axon hillock has greatest in a sodium plus channel concentration Ref : guyton and hall textbook of medical physiology 12 edition page number:66,67,68