This phenomenon is called the All or None response.
The all-or-none law states that a single neuron or muscle fibre will either respond completely or not at all.
A neuron transfers information down an axon and toward the synapse if an action potential is triggered by a powerful enough stimulus. The signal travels the length of the axon as a result of changes in cell polarisation.
The internal potential of a neuron is approximately -70 millivolts when it is at rest. Ion channels open when the membrane depolarizes as a result of the stimulus activation. As a result, sodium ions enter the process and alter the axon's polarisation.
The action potential will fire once the cell depolarizes to the necessary level. This activity is not graded; according to the all-or-nothing law, it either occurs or it doesn't.
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