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The animation starts by describing the relationship between muscle fibers and their innervation in vertebrate muscles. The motor units are identified and the motor endplate relationship on the fiber surface is discussed. The scene next shows a close-up of the neuromuscular junction (motor endplate) and describes how a nerve impulse activates the muscle fiber to produce an action potential in the fiber to produce contraction. Finally, the scene ends by showing the relationship between nerve stimuli and the amount of muscle shortening to demonstrate graded muscle contractions.--------------------------------------------------------------------------------------
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