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This animation describes how muscles are innervated and stimulated to contract in invertebrate animals using the insect muscle as a model. Because insects are small animals, they must conserve internal body space. Therefore, insects have fewer body cells, and muscles consist of fewer muscle fibers. Compared to vertebrate muscles, insects have modified both the innervation and the nevous controls of muscle fiber contraction. The animation describes poly-neuronal innervation and multi-terminal endplates and shows how fast, slow and inhibitory neurons control the fibers in an insect muscle unit to produce total contractions or graded contractions.--------------------------------------------------------------------------------------
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