In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as :

In a nerve cell, the electrical impulse travels along the axon. When it reaches the axonal end, it must cross a gap to reach the next cell (like a muscle cell or another neuron). This site is the synapse or, specifically when connecting to a muscle, the neuromuscular junction. Here, the electrical impulse triggers the release of chemical substances (neurotransmitters) which act as chemical signals.

• Option (a) Axon: This part conducts the electrical impulse away from the cell body but does not convert it to a chemical signal itself.
• Option (b) Dendrites: These receive chemical signals from other neurons and convert them into electrical impulses.
• Option (d) Cell body: This part contains the nucleus and integrates incoming signals but is not the site of signal conversion for transmission.