Option (4) is the correct answer as impulse transmission across an electrical synapse is always faster than that across a chemical synapse. → Chemical synapses use chemicals for transmission which are known as neurotransmitters. → The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse. → In an electrical synapse, the transmission of the impulse occurs in the form of an electrical current from one neuron to the next neuron