Illustration of the cells involved in a reflex arc. A reflex arc is an involuntary response to a stimulus (such as pain) that allows a quick action by by-passing the conscious brain. A sensory neuron (nerve cell, left) detects the stimulus and passes a signal to an interneuron (centre). The interneuron passes the signal to a motor neuron (right), which effects a response.

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Photo credit: © FRANCIS LEROY, BIOCOSMOS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -, arc, artwork, automatic, axon, background, biological, biology, black, cell, cells, circuit, illustration, interneuron, involuntary, motor, nerve, nervous, neural, neurology, neuron, neurone, neurones, neurons, pathway, reflex, relay, sensory, system