微丝与肌肉收缩 W 肌纤维束 肌肉 (a) cle (b)Bundle of muscle fibers (muscle cells) (d)Myofibrils ®蓝】菱 Nucleus 肌原纤维 肌纤维 肌原纤维 (e)Single (c 根肌纤维就 是一个细胞 Thick filaments Thin filaments Figure 23-10 Levels of Organization of Skeletal Muscle Tissue laterally.giving skeletal muscle its striated appearance.(f)The unit of (a)Muscle tissue is attached by means of tendons to the specific bones it contraction along each myofibril is the sarcomere.in which thick must move.(b)The tissue consists of bundles of muscle fibers.(c)each filaments interdigitate with thin filaments.The thick and thin filaments of which is a long.thin multinucleate cell.(d)Within each cell are many consist primarily of myosin and actin,respectively. 主讲：汤 myofibrils.(e)Each myofibril consists of bundles of filaments aligned 主讲：汤 华 微丝与肌肉收缩 肌纤维束 肌原纤维 肌纤维 肌原纤维 一根肌纤维就 是一个细胞 肌肉