Saltatory

I think the second question is referring to thicker axons having nodes of Ranvier and thus can perform saltatory conduction. This would decrease the need for Na+ channels. The answer to the first question sounds pretty reasonable.

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The gates are concentrated at the nodes of ranvier. it's called saltatory conduction. here: http://en.wikipedia.org/wiki/Saltatory_conduction

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I need help understanding saltatory conduction in nerve fibers. I understand how an action potential functions at a local node, but I don't fully understand how that event directly triggers the action potential at the next node. Are the ...

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i know for thesecond its called the saltatory conduction. but why does it increase the speed?

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... spreads passively to the next node. Thus, an action potential propagates along a myelinated axon by jumping from node to node, a process called saltatory conduction. This type of conduction has two main advantages: action potentials travel faster, and metabolic energy is conserved because the ...

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