What is an analogy for the nerves in a human body and electric wires?

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Electrical wires transmit electrical currents (electrons) along the wire and are encased in a insulated jacket that keeps the wires from short circuiting with neighboring wires so the electrical current can travel quickly and efficiently along the wire. Nerves resemble these wires in that the axons of the nerve fibers are similar looking as they are enclosed in a myelinated sheath. Nuerons do not transmit electrical currents, but rather they transmit charged ions.
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What is a cell analogy to a human body?

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