Neurons & Action Potentials 2.pptx

Channels whose permeability depends upon the voltage

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channels whose permeability depends upon the voltage difference across the membrane Sodium and potassium channels are voltage activated channels When sodium channels are opened, positively charged sodium ions rush in and a subsequent nerve impulse occurs
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Action Potential After an action potential occurs, sodium channels quickly close The neuron is returned to its resting state by the opening of potassium channels Potassium ions flow out and take with them their positive charge The sodium-potassium pump later restores the original distribution of ions
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Action potentials are actively propagated ( regenerated ) along the axon. Each adjacent section is depolarized, and a new action potential occurs. Action potentials travel in only one direction because of the refractory state of the membrane after a depolarization.
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Action Potential All-or-none law = the amplitude and velocity of an action potential are independent of the intensity of the stimulus that initiated it Action potentials are equal in intensity and speed within a given neuron
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