This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Which is TRUE regarding nerve conduction 
Select and explain. 
A. All or none phenomenon, B. Conduction independent of amplitude, C. Propagated action potential is generated in dendrites, D. Faster in unmyelinated fibres
A: All or none phenomenon
Answer: A: All or none phenomenon 
Explanation: An action potential is generated in axon hillock or its initial segment. Then it propagates at a constant velocity and amplitude through the fibre without any decrement. 
This propagation is faster in myelinated nerve fibres than the unmyelinated fibres.