Action potential has to do with how well the signal travels across nerves.
During conduction of an action potential, the passive spread of depolarization to the adjacent distal region of membrane slightly depolarizes the new region, causing opening of a few voltage-gated Na+ channels and an increase in Na+ influx. 1
- The Action Potential and Conduction of Electric Impulses – Molecular Cell Biology. 4th edition – https://www.ncbi.nlm.nih.gov/books/NBK21668/