what is the reflex arc
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the nerve pathway involved in a reflex action, including at its simplest a sensory nerve and a motor nerve with a synapse between.
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In a reflex arc, an action potential never travels to the brain for processing and so results in a much quicker reaction. When a stimulus (A) is encountered, the signal from that stimulus will travel up the sensory neuron (B, in green) to the spinal column (C). There, it will likely pass through a short interneuron (D, in purple) before continuing down a motor neuron (E, in blue) to the origin of the signal. Then, a contraction of the muscles (F, in red) is triggered, moving the bone (G).
A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neuronsdo not pass directly into the brain, but synapse in the spinal cord. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain. However, the brain will receive the sensory input while the reflex is being carried out and the analysis of the signal takes place after the reflex action.
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A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neuronsdo not pass directly into the brain, but synapse in the spinal cord. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain. However, the brain will receive the sensory input while the reflex is being carried out and the analysis of the signal takes place after the reflex action.
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