In the resting state of the axon, the atrady voltage difference across the plasma mombrane, called the
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is typically
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An action poseorial is initiated each time the mombrane potential is nised to the ection potentials never occur below this level and upon occurring always display the sume
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Ievel. Because potentials are saild to be
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or
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crease. action Action potencials travel in one direction only along an axon because belind the potential the membrane is in a brief
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period when if is inservitive to new stimulation.