What is Action potential?

What is Action potential?
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Answer :

When the graded potential passes the neurons threshold, an action potential takes place. The action potential sends the signal the entire length of the cell and never dies within the cell, which can be referred to as the all-or-none-principle. During firing the inside of the cell becomes positive, which is sometimes incorrectly called Depolarization and should be called the raising phase of the action potential. After the action potential hits its peak the cell starts the refractory phase.
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