The part of the neuron that is usually a single long extension that conducts an impulse to a muscle or another neuron is the:

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The axon is a long extension of the neuron that transmits impulses away from the cell body and toward other neurons, muscles, or glands. The dendrites, on the other hand, receive impulses from other neurons and transmit them toward the cell body. The synapse is the small gap between neurons where neurotransmitters are released to facilitate communication. The cell body contains the nucleus and other structures necessary for the survival and functioning of the neuron. The node of Ranvier is a gap in the myelin sheath that helps to facilitate the transmission of impulses along the axon.

The Part of the Neuron That Is Usually a Single