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The resting potential tells about what happens when a neuron is at rest. An action potential occurs when a neuron sends information down an axon, away from the cell body. Neuroscientists use other words, such as a spike or an impulse for the action potential. The action potential is an explosion of electrical activity that is created by a depolarizing current. This means that some event (a stimulus) causes the resting potential to move toward 0 mV. When the depolarization reaches about -55 mV a neuron will fire an action potential. This is the threshold.
View Full Document. 08/30/14 page 7 Review Sheet Results 1. Define the term threshold as it applies to an action potential. Your answer: Threshold is the voltage that must be reached in order to generate an action potential. 2. What change in membrane potential (depolarization or hyperpolarization) triggers an action potential?