Question

During action potential propagation in an unmyelinated axon, why doesn't the action potential suddenly "double back" and start propagating in the opposite direction

Answer 1

Explanation:

During action potential propagation in an unmyelinated axon, why doesn't the action potential suddenly "double back" and start propagating in the opposite direction? ... This means the nodes are much more permeable to ions than the myelinated segments where voltage-gated channels are absent.