The nerve impulse flows in one direction. The dendrites receive incoming nerve impulses from other neurons. This impulse travels from the dendrite to the cell body and then at the end of the axon transmits the impulse to another neuron or receptor.

Explanation: one single path is followed from neuron to neuron. This tells it is a unidirectional process. The axon have doesn’t have the ability to take up stimulus and only cell body of neuron can take up signal because it has dendrites. This means every part of neuron has specific function in a synchronised manner.