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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.
SHEET EXERCISE 2 Skeletal Muscle Physiology NAME: Jasmine Young LAB TIME/DATE: 1. Define each of the following... terms: â¢ motor unit - A motor unit consists of a motor neuron and all of the muscle fibers it innervates. â¢ twitch - Skeletal Muscle twitch is the mechanical response to a single action potential.