Where does the electrical impulse gets converted into chemical signal for onward transmission?

Electrical impulse gets converted into chemical signal at the nerve terminal or synapse. When a nerve impulse reaches the nerve terminal or synapse, it stimulates the fusion of synaptic vesicles (pre and post synaptic vesicles) and release of neurotransmitter. The released neurotransmitter binds to specific receptors present on post synaptic neuron. ​It opens the ion channel on the plasma membrane, allowing the entry of ions that generates a new action potential in post synaptic neuron.