Skeletal Muscle Organization: Fascicle to Sarcomere
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Skeletal muscle organizes hierarchically: a muscle bundles fascicles, each fascicle bundles muscle fibers, each fiber bundles myofibrils, and each myofibril divides into repeating contractile units called sarcomeres.
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A single muscle fiber can contain thousands of myofibrils running its full length.
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A muscle "fiber" is one elongated cell, not a bundle of separate cells despite the bundling language at every larger level.