Myelination and saltatory conduction
Myelination increases conduction velocity because it:
Answer B: explanation for every choice
A
Voltage-gated Na⁺ channels are concentrated at the nodes, not spread along myelinated segments.
B
Correct. Myelin insulates the axon, so the signal is regenerated only at the nodes.
C
Myelin wraps the axon. Larger axon diameter speeds conduction separately.
D
Myelin does not change the refractory period of the membrane.
TakeawaySaltatory conduction: insulation plus nodes of Ranvier.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID bb86.