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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.
Summation requires increasing stimulus frequency. At low frequency, the muscle fiber will relax before the next stimulus impulse occurs. As the stimulus frequency increases and the time between the stimuli decreases, the muscle fiber cannot fully relax before the next stimulus occurs (see Fig. 2). This loss of relaxation between stimuli is called tetanus.