Answer:
The nerve impulses are carried out by a small gap called synapse between a pair of neurons by means of a neurotransmitter, when the nerve impulse travelling through the first neuron reaches the axon endings. It releases tiny amount of a chemical substance into the synapse. This chemical substance crosses the gap and starts a similar electrical impulse in the dendrite of the next neuron. From dendrite, the nerve impulse is carried to the cell body and then to the end. It can then be transferred to the third neuron in a similar way. This process continuous till the electrical impulse reaches the brain or spinal cord.
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