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        9-12

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        Muscles, Part 2: Organismal Level |Crash Course A&P 22

        In which we explain how skeletal muscles work together to create and reverse movements. Learn about the role size plays in motor units, the three phase cycle of muscle twitches, and how the strength and frequency of an impulse affects the strength and duration of a contraction. This episode also explains twitch summation, tetanus, and isotonic vs. isometric movements.

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