plural sarcomeres
Definition of sarcomere
: any of the repeating, contractile, structural subunits of striated muscle cells (as of skeletal or cardiac muscle) that are composed of the protein filaments actin and myosin Basically, during contraction a sarcomere shortens like a collapsing telescope, as the actin filaments at each end of a central myosin filament slide toward the myosin's center.— Jesper L. Andersen et al. — see z line
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Time Traveler for sarcomere
The first known use of sarcomere was in 1891
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