Human Anatomy and Physiology

What is the all or nothing response of an action potential?

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2008-04-10 10:51:39

All or nothing response of an action potential (AP), refers

simply to the fact that an AP will either occur, or not. There is

no gradient, no half APs or double APs. The only option is AP, or

no AP. Like in computer binary, the response is either 1 (an AP) or

0 (no AP).

All the factors trying to induce (or inhibit) an action

potential (i.e other action potentials, EPSPs and IPSPs) add up

(summate) at the axon hillock, (aka the trigger zone). Here, if the

stimulation is big enough an action potential will occur. If the

stimulation is not big enough, no action potential occurs.

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