Answer:
The synapse actually act
like a one-way valve because the chemical substance is present only on one side
of the gap. This chemical diffuses towards the dendrite end of next neuron
where it generates an electrical signal.
Since, the chemicals
are absent at the dendritic end of neuron, the nerve impulse can go across only
from one side (which contains the chemical substance). In this way, it is
ensured that nerve impulses travel in only one direction (through of particular
set of neurons).
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