Final answer:
An axon is a long, thin extension of a neuron's cell body that transmits nerve impulses to other cells. It branches at the end into axon terminals, where nerve impulses are transmitted to other cells.
Step-by-step explanation:
An axon is a long, thin extension of the cell body of a neuron. It transmits nerve impulses away from the cell body and towards other cells. The axon branches at the end, forming axon terminals, where nerve impulses are transmitted to other cells, such as the dendrites of other neurons or muscle cells.