CBSE Class 10 Science 2019 · Paper 31/3/1 · Question 4(b)

Nerve impulse: The information (message) carried along a nerve fibre in the form of an electrical signal (electrical impulse) is called a nerve impulse. Direction: The impulse is picked up at the tips of the dendrites of a neuron. It travels from the dendrite to the cell body, and then along the axon to its end (the nerve ending). There it releases chemicals that cross the synapse and start a similar impulse in the dendrite of the next neuron: dendrite $\to$ cell body $\to$ axon $\to$ nerve ending $\to$ synapse $\to$ dendrite of the next neuron. In the body, impulses thus travel from the receptors along sensory nerves to the brain or spinal cord, and from there along motor nerves to the muscles or glands.