Add more neurons. Instead of going into a full detailed explanation of how the action potentials work - and to attract a lot of unnecessary and uninteresting technical information that you have already encountered in biology lessons in 9th grade - we will immediately go over to the basic ideas that will help us. The trunk of our guy's body - the neuron axon - has a negative "resting potential", that is, when he is at rest, his electric charge is slightly negative. Several people feet constantly touch the hair of our guy, the dendrites of the neuron, whether he likes it or not. Their legs drop chemicals onto his hair - neurotransmitters - that pass through his head (the body of a cell, or catfish) and, depending on the chemical, increase or lower his body's charge.
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