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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.
1 Lec.15 Medical Physiology Z.H.Al-Zubaydi Contraction of a Skeletal Muscle as a Whole Graded Responses In skeletal muscles, the all-or-none law of muscle physiology applies to the muscle cell, not to the whole muscle.