 Presumably, these are the same mechanisms that are involved in the beating of our hearts, right? I mean, that's all electrical. Yes, exactly, exactly. It's a special case because in the heart, they are connected. So I didn't mention that the nerve impulse isn't purely electric. It's electrochemical because the action potential, the electrical thing, sets off the sort of serotonin and all those little chemical bits that also pass on the signal. But the heart has a special pacemaker, right?