An impulse carrier is a type of biological cell that is responsible for transmitting electrical signals throughout the body. The three main types of impulse carriers are axons, nerves, and neurons. Axons are long, thin fibers that extend from the cell body and carry electrical signals away from the cell. Nerves are bundles of axons that transmit signals to and from the brain and spinal cord. Neurons are specialized cells that receive, process, and transmit information throughout the body.