Chemical reactions involve chemical changes or transformations that occur within biological systems. In terms of nerve impulses, chemical reactions come into play at synapses when neurotransmitters are released to transmit signals between neurons.
It is the process where neurotransmitters that have been released into the synapse are reabsorbed by the neuron that released them.
Excitatory and Inhibitory Signals: Excitatory signals increase the likelihood of an action potential occurring in the postsynaptic neuron, while inhibitory signals decrease this likelihood.