Sarcomere definitions

sär'kə-mîr'
One of the segments into which a fibril of striated muscle is divided.
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Any of the segments making up the fibrils of striated muscles.
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One of the repeating contractile segments into which a myofibril is divided, composed of actin and myosin filaments and giving striated muscle its distinctive bands.
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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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(anatomy) The contractile unit of the myofibril of a striated muscle.
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Origin of sarcomere

From sarco- (“flesh") +"Ž -mere (“component"), from Ancient Greek σάρξ (sárx) and μέρος (méros).