Answer:
Reflex action is a
rapid, automatic response to a stimulus which is not under the voluntary
control of the brain i.e., it is an involuntary action. It is a simple form of
behaviour in which the same stimulus produces the same response every time. e.g.,
(i) If we
unknowingly touch a hot plate, we immediately move our hand away from it.
(ii)Moving
our foot away on stepping something sharp
Other
examples are knee jerk, coughing, yawning, sneezing etc.
The pathway
taken by nerve impulse in a reflex action is called the reflex arc
Reflex arcs
have evolved in animals because the thinking process of brain is not fast enough.
However, even after complex neuron networks have come into existence, reflex are
continue to be more efficient for quick responses.
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