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All or Nothing Response
This refers to the action potential of a neuron. Action potential is a rapid change in the membrane potential of an excitable cell. Action potentials occur whenever a depolarization increases the membrane voltage to a particular value called the threshold. Once initiated, the action potential has a magnitude that is independent of the strength of the stimulus.
Action potential occurs fully or not at all. This makes it an All-or-None repsnse to stimuli. This reflects the fact that depolarization opens voltage-gated sodium channels that cause more depolarization. This positive feedback loop of channel and depolarization triggers an action potential whenever it reaches the threshold.
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