Question

where the electrical impulse must be converted into a chemical signal for onward transmission

Answer 1

Hi dear may it help you.........

The electric impulse when travels from one neuron to other it has to travel through a small gap called synapse where the chemical substance called neurotransmitter is released  so that the signal can go for onward transmission.

Synapse is a microscopic gap between a pair of adjacent neurons over which nerve impulses pass when going from one neuron to the next is called a synapse......

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