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Reflex arc


reflex arc: the simplest unit of nervous activity; involved in the detection of a stimulus in the environment by sensory nerve endings, followed by impulses that travel via the sensory neurons to the spinal cord.
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reflex arc Pathway of neurons, effector(s) and sensory receptors that participate in a reflex.
region of division The area of cell division in the tip of a plant root. PICTURE ...
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Within the spine a reflex arc switches the signals straight back to the muscles of the body (in this case the arm or the leg) (effectors) via an intermediate nerve cell and then a motor nerve cell; contraction of the leg occurs, ...
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