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extremely long skeletal muscle cells that often can extend as far as the muscle they are within> divided up (along their length) into functional units called sarcomeres > a muscle fiber = a bundle of lots of myofibrils> contract ONLY when signaled by a nerve

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1.
extremely long skeletal muscle cells that often can extend as far as the muscle they are within
> divided up (along their length) into functional units called sarcomeres
> a muscle fiber = a bundle of lots of myofibrils
> contract ONLY when signaled by a nerve





 
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