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What is Reflex Action?
Reflex is an involuntary and sudden response to stimuli. It happens to be an integral component of the famed survival instinct.
The Action of Neuron
Two neurons dominate the pathway, afferent nerves (receptor) and the efferent nerves (effector or excitor).


Firstly, it begins with receptor detecting the stimulus or a sudden change in the environment, where the instinct again has a role to play. The stimulus is received from a sensory organ.
Then, the sensory neuron sends a signal to the relay neuron.
This is followed with the relay neuron sending the signal to the motor neuron.
Further, the motor neuron sends a signal to the effector.
The effector produces an instantaneous response, for example, pulling away of the hand or a knee-jerk reaction.
Reflex arc : The pathway of reflex action