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noun, Biology.
any of the segments of myofibril in striated muscle fibers.
any of the units that together comprise skeletal muscle

sarcomere sar·co·mere (sär’kə-mēr’)
One of the segments into which a fibril of striated muscle is divided.
The contractile unit of a skeletal muscle fiber. Sarcomeres are divided into bands of filaments made of actin or myosin. During muscle contraction, the filaments slide over each other to cause shortening of the sarcomere.


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