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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.
The all-or-none concept of skeletal muscle contraction means that. all muscles contract completely and not partially. muscle fascicles contract completely. muscle fibers contract completely. all of the actin and myosin molecules contract.