What are the steps involved in generating an action potential? What does it mean for an action potential to be all-or-nothing?

An action potential is caused by either threshold or suprathreshold stimuli upon a neuron. It consists of four phases; hypopolarization, depolarization, overshoot, and repolarization.

*Part 2 of the question*

An action potential occurs when a neuron sends information down an axon, away from the cell body. ... Therefore, the neuron either does not reach the threshold or a full action potential is fired - this is the "ALL OR NONE" principle.

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