Reflex action: Jt is defined as an unconscious, automatic and involuntary response of effectors, i.e. muscles and glands, to a stimulus, which is monitored through the spinal cord.
Mechanism of reflex action : It involves the following steps:
- Receptor organ like skin perceives the stimulus and activates a sensory nerve impulse.
- Sensory organ carries message in the form of sensory impulse to the spinal cord.
- The spinal cord acts as modulator : The neurons of spinal cord transmit the sensory nerve impulse to motor neuron.
- Motor never conducts these impulses to the effectors like leg muscles which responds by pulling back the organ away from the harmful stimulus.
