velleee
velleee velleee
  • 31-10-2020
  • Health
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What happens to the muscle fibers as the arm flexes and extends?

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emily82039
emily82039 emily82039
  • 31-10-2020
When a muscle contracts, the contractile fibers shorten it to an even larger bulge. For example, extend and then flex your biceps brachii muscle; the large, middle section is the belly
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