when a muscle contracts,it performs work. it does this by
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MUSCLE CONTRACTS TO DO SOME WORK...
THIS IS DONE BECAUSE MUSCLE CELLS HAS A SPECIAL PROTEIN IN THEM
MARK IT AS BRAINLIEST AND FOLLOW ME (◍•ᴗ•◍)❤(◍•ᴗ•◍)❤(◍•ᴗ•◍)❤(◍•ᴗ•◍)❤(^~^)
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