NTSE Stage 2 SAT 2014 Question Paper

Reflex action is a spontaneous rapid motor response to a stimulus. A simple reflex action consists of 5 components—
1. Receptor (Responds to stimulus).
2. Sensory neuron (Receptor to axon & transmits impulse).
3. Integration center (sensory impulse to motor impulse).
4. Motor neuron (efferent impulses from integration Centre).
5. An Effector responds (glands, muscles)
Hence, the sequence of events in a reflex action are →
Receptor → sensory neuron → CNS → motor neuron → effector responds.