Graded Potential vs AP

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Graded Potential vs AP

Post  funcrazgrl on Tue Feb 26, 2008 12:53 am

What's the difference between graded potential and action potential? I didn't get to copy it during review session. Thanks.

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Re: Graded Potential vs AP

Post  serasarah18 on Tue Feb 26, 2008 1:06 am

In a graded potential, the magnitude of the hyperpolarization or depolarization varies with the strength of the stimulus. So the stronger the stimulus is, the larger change there will be in the membrane potential. However, action potentials is all or nothing and does not depend on the magnitude of the stimulus. As long as it reaches threshold, action potential will carry out.

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Re: Graded Potential vs AP

Post  serasarah18 on Tue Feb 26, 2008 1:20 am

To add, an example of graded potentials is in a postsynaptic neuron. The sum of excitatory graded potentials can lead the axon hillock to produce an action potential if the sum reaches threshold.

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