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All-or-none Response: Phenomenon in which a muscle fiber contracts completely when exposed to a threshold stimulus, or not at all. When a skeletal muscle is stimulated to contract by a motor neuron a minimum amount of stimulus is needed to start the process of muscle contraction.
Best Answer: The all or none principle behind muscle contraction is simple...the strength by which a nerve or muscle fiber responds to a stimulus is not dependent upon the strength of the stimulus. So, any stimulation above the normal threshhold will trigger a neve or muscle fiber to give a COMPLETE response, or none at all. They found this out in 1871 while studying cardiac muscle function.