Question

Draw and explain how the nerve cells help in transmission of impulses?

Answer 1

                          (a) Structure of neuron

                              (b) Neuromuscular junction

1. All information from our environment is detected by the specialised tips of some nerve cells. The information acquired at the end of the dendritic tip of a nerve cell (Fig. a) sets off a chemical reaction that creates an electrical impulse.
2. This impulse travels from the dendrite to the cell body and then along the axon to its end. At the end of the axon, the electrical impulse sets off the release of some chemicals.
3. These chemicals cross the gap, or synapse, and start a similar electrical impulse in a dendrite of the next neuron. This is how nervous impulses travel in the body (Fig. b).