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group fitness

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Last update by stevens_jenn23 on 02/24/2010
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group fitness
group fitness
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Question: when does a muscle contraction occur?what is it the result of?
Answer: occurs when an electronic impulse is transmitted from the brain to the muscleis the result of the interaction of the actin and myosin filamints, which causes a shorterning of the individual sarcomeres and therefore a shortening of their associated muscle fibers