muscle membrane . labeled scheme with myofibril, disc, zone, line and band. anatomical mitochondria diagram.

actin anatomical anatomy band biological biology body care cisternae closeup colorful diagram disc examination filament health histology human illustration isolated labeled layer line medical medicine membrane microscopic mitochondrial muscle myofibril myosin nucleus opening organ reticulum sarcoplasm sarcoplasmic scheme section structure system terminal thick thin tissue transverse tubule zone