They are positively charged so electrical signals are actually not created by long migrations of electrons, but by short diffusion of positive charges across membranes, that temporarily reverse local polarization. This depolarization triggers nearby regions to do the same, creating depolarization waves: https://en.wikipedia.org/wiki/Depolarization

It's very fascinating, also because controlling the cross membrane diffusion of ions allows for controlling the signals. Which is what neurotransmitters do