Lecture8_sqkey - 1) Which factors determine the velocity of...

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1) Which factors determine the velocity of an action potential propagation? Action potentials travel fastest in axons that are large diameter and myelinated . What determines the direction that action potential propagates to? The refractory period of an action potential causes that region of membrane be temporarily unresponsive to another stimulus. This ensures that action potentials migrate in one direction, namely, away from the soma . 2) What is the main differences between an action potential and a graded potential? Action potential is an " all-or-none " response vs. graded potential which is of variable intensity. For any given neuron, all action potentials are of the same intensity. This is referred to as the " all-or-none " principle. In order to alter the intensity of a given neuronal stimulus, the rate of firing of action potentials is increased. 3) Describe the how the repolarization stage of an action potential is generated and terminated.
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This note was uploaded on 02/21/2010 for the course IB 132 taught by Professor Brooks during the Spring '08 term at University of California, Berkeley.

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