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Myofibrils are organized in a highly structured manner within muscle fibers, consisting of repeating units called sarcomeres. Each sarcomere contains thick filaments (myosin) and thin filaments (actin) arranged in a specific pattern, allowing for coordinated contraction. This organization gives skeletal and cardiac muscle its striated appearance and is essential for muscle function, as the sliding filament mechanism operates within this structure. The alignment of myofibrils in parallel within muscle fibers contributes to the overall strength and efficiency of muscle contraction.

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1mo ago

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