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myofibril vs. muscle fiber

myofibril
[mahy-uh-fahy-bruhl, -fib-ruhl] / ˌmaɪ əˈfaɪ brəl, -ˈfɪb rəl /

noun

Cell Biology.

  1. a contractile fibril of skeletal muscle, composed mainly of actin and myosin.

muscle fiber

noun

  1. one of the structural cells of a muscle.