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The texts, online materials describe the velocity of conduction of action potential depends on axon's length and cross sectional area e.g. short length and large diameter decreases the resistance. Myelin sheath increases the speed of conductivity as well.
Can someone explain why chemical synapses allow quicker conduction than regular arrangement of sodium fast channels along the axon? Can regular arrangement of Na channels help in propagation of AP (I guess it's referring to the nodes of Ranvier)? What's the difference between fast sodium channel and a 'normal' sodium channel?
The question is: Of the following, which allows action potentials to conduct quicker? 1. Chemical synapses 2. Regular arrangement of sodium fast channels along the axon 3. Small axon diameter 4. Depolarisation suppression through the majority of the axon's length
I picked 2, but the answer is 1. I want to know the reason behind me being wrong and that being correct. 1 doesn't make sense at all to me. Come to think of it, I see that 4 could be the most relevant.