These phenomena represent the reflex arc. The right order is:
1. Receptors in her toe receive stimuli
2. The sensory neurone generates an impulse.
3. Interneurones relay the impulse to motor neurons in the spinal cord.
4. Motor neuron signal the leg muscles
5. She immediately moves her foot.
The reflex arc is a type of nerve circuit that results in the production of a reflex. Information that comes from the environment is captured by sensory receptors that transcribe the information into a nerve message, addressed to the central nervous system that interprets it and sends response nerve stimulation to generate a response.
Among the mechanisms using a reflex arc, there are osteotendinous reflexes: an external stimulation will cause information at the level of a sensory, afferent or centripetal neuron, which transmits the information, then the response generated by the central nervous system cell. will go through a motor neuron, efferent or centrifugal which will cause reflex contraction of a muscle.
Similar phenomena exist for other functions, especially at the hormonal level with the stimulation of the glands secreting molecules in response to certain stimulations.
