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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.
 
Chocies:
how long it takes for the voltage-gated Na+ channels to reactivate at the end of an action potential
how long it takes for the voltage-gated Na+ channels to close at the end of an action potential
how long it takes for the membrane potential to return to resting potential after the undershoot phase
how low the membrane potential drops below resting potential during the undershoot phase
how long it takes for the voltage-gated K+ channels to close during the undershoot phase
Source  mastering biology
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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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