Any change in the cell polarization will result in a signal going all the way down the axon. The action potential occurs when any neuron is sending information down the axon and away from the body of the cell going towards the synapse. We need to understand what action potential is before we can understand the all-or-none law.
His descriptions describing the contractions of the cardiac muscles explained that when a shock with sufficient strength is introduced when the muscle or nerve fires it will produce the biggest contraction that it possibly can, depending on the condition of that specific muscle or nerve at that time. This all-or-none law was originally described by the physiologist Henry Pickering Bowditch in 1871.Īlthough all his reference was specific to the cardiac muscles, it was more than 4 decades later that conventional medicine discovered that this all-or-none law applied to other neurons of other muscle groups not related to the heart, responded in the same way.
The nerve/muscle fiber will either fire or it won't, it is not dependent on the strength of the specific stimulus it received for that tissue or nerve. The definition of the all-or-none law is actually based on a principle which states that when a nerve cell or muscle fiber responds, it is dependent on the strength of that stimulus because if the signal received is above a specific threshold, the nerve and/or the muscle fiber will fire or it will not. All or None Principle of Muscle Contraction
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