Nerves are NOT groups of cells that work together. Instead, nerves are bundles of fibers that transmit signals throughout the body. These fibers are actually axons, which are long, thin extensions of nerve cells (neurons).

Here's the breakdown:

* Neuron: The basic unit of the nervous system. Each neuron has a cell body, dendrites (receive signals), and an axon (transmit signals).

* Axon: The long, slender projection of a neuron that carries signals away from the cell body.

* Nerve: A bundle of axons (and sometimes dendrites) that transmit signals together, like a cable carrying many wires.

So, while nerves are made up of parts of neurons, they are not groups of cells themselves. They are like cables that carry information throughout the body, connecting different parts of the nervous system.