Why are Action Potentials Usually Conducted in One Direction

Question

Why are action potentials usually conducted in one direction?
A)The nodes of Ranvier conduct potentials in one direction.
B)The brief refractory period prevents reopening of voltage-gated Na⁺ channels.
C)The axon hillock has a higher membrane potential than the terminals of the axon.
D)Ions can flow along the axon in only one direction.
E)Voltage-gated channels for both Na⁺ and K⁺ open in only one direction.

Accepted Answer

During an action potential, the brief refractory period prevents reopening of voltage-gated Na⁺ channels, which ensures that the action potential only moves in one direction along the axon.