The all-or-none law refers to a neuron's ability to either release all or none of its neurotransmitter when an action potential occurs in its axon.

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The all-or-none law refers to the principle that the strength of a response of a nerve or muscle fiber is not dependent on the strength of the stimulus. If a stimulus is above a certain threshold, a nerve or muscle fiber will fire an action potential at its full strength; if the stimulus is below this threshold, it will not fire at all. It does not specifically refer to the release of neurotransmitters, but rather to the generation of action potentials.

The All-Or-None Law Refers to a Neuron's Ability to Either