stucture of myofibril
Please find below the solution to the asked query
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Myofibrils or myofilaments (parallel arrangement of filaments) are present inside the sarcoplasm of muscle fibre.
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Structure of Myofibril:
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Each myofibril has alternate light and dark bands on it (striated appearance).
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Light band: Contains the protein actin and is called the I band (Isotropic band)
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Dark band: Contains the protein myosin and is called the A band (anisotropic band)
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Actin: Thin filament; Myosin: Thick filament
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Actin and myosin are arranged parallel to each other as rod-like structures.
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Z line: An elastic fibre which bisects the I band. Portion between two Z lines represents a functional sarcomere.
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In resting state, the thick filament partially overlaps the free ends of the thin filament.
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H zone: The zone where the thick filaments are not overlapped by the free ends of the thin filament
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M line: Holds the dark band at the centre; thus, it bisects the H zone.
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Hope this information will clear your doubts about the structure of myofibril.
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