Simple: signals travel through the brain through to a kalium-natrium cascade reaction (not even a real chemical reaction, just a gradient change), and every tim

Simple: signals travel through the brain through to a kalium-natrium cascade reaction (not even a real chemical reaction, just a gradient change), and every time they hit a synapse it becomes a lot more complex involving a dozen plus neurotransmitters. (This is why a kalium/potassium injection will kill you: it reverses the gradient for a long, long time, meaning the nerves cannot fire during that time, which means your heart and breathing (and everything else) stops. Incidentally, this also fires every pain nerve in your body so it should be unbelievably painful, and survivors do report that. Kalium is the Latin word for potassium) Electrical conductivity is barely used at all. It is used in the processing of the resulting signal, but not in transmitting it. Even that part is very different from a current on a wire or through a transistor. This video describes the 99.99% part well (99.99% in terms of distance, which is the axons): https://www.youtube.com/watch?v=C_H-ONQFjpQ https://www.youtube.com/watch?v=C_H-ONQFjpQ