action potentials move along axons
The action potential travels down the axon as the membrane of the axon depolarizes and repolarizes. — Nodes of Ranvier are gaps in the myelin along the axons; they contain sodium and potassium ion channels, allowing the action potential to travel quickly down the axon by jumping from one node to the next.
Why does an action potential move in one direction?
Biologically, action potentials are propagated in one direction due to how neurons are connected to each other. Signals are transmitted across synapses to eventually the soma of a neuron. — If you apply a depolarizing potential to the axon hillock, then the signal will propagate in the correct direction.
How does an action potential spread along the cell membrane?
Propagation of the Action Potential
Going down the length of the axon, the action potential is propagated because more voltage-gated Na+ channels are opened as the depolarization spreads. This spreading occurs because Na+ enters through the channel and moves along the inside of the cell membrane.