Answer:
The neurons lie end to
end in a chain to transmit the impulses in an animal body. The neurons are not
connected. There occurs a very minute gap between terminal portion of axon of
one neuron and dendron of the other neuron. This gap is called synapse. At the
end of the axon, the electrical impulse sets off the release of some chemicals.
These chemicals cross the gap (synapse), and start a similar electrical impulse
in dendrite of the next neuron. Synapses actually act like one way valves. This
is because the chemical substance is present at only one side of the gap. In
this way synapse ensures that nerve impulse travels only in one direction.
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