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The strength of a stimulus (for example, whether you feel a slight pain versus an intense pain) determines the number of action potentials sent along an axon. As the graphs show, a strong stimulus produces more action potentials spaced more closely together than a weak stimulus.
 The time between when a first action potential ends and a second action potential can be triggered is determined by the axon’s refractory period. A second action potential cannot be triggered until the end of the refractory period.
 
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how long it takes for the voltage-gated Na+ channels to reactivate at the end of an action potential

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