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Threshold Stimulus
Stimulus resulting in a local potential just large enough to reach threshold and produce an action potential.
All-Or-None Contraction
A principle stating that a nerve or muscle fiber responds completely or not at all to a stimulus once the stimulus reaches a threshold value.
Muscle Fiber
A single, elongated muscle cell that can contract in response to stimulation.
Motor Unit
Single neuron and the muscle fibers it innervates.
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