1.1 The structure of skeletal muscle fiber under lm Transverse section Shape of muscle fiber: Irregular and polyhedral Nuclear: periphery, round Myofibril in sarcoplasm red dots
1.1 The structure of skeletal muscle fiber under LM Transverse section------- Shape of muscle fiber: Irregular and polyhedral Nuclear: periphery, round Myofibril in sarcoplasm :red dots
1.2 The structure of skeletal muscle fiber under em 12.1 Myofibril: myofilament(肌丝) thick myofilament and thin myofilament) ()Arrangement: 一个肌节M线 个肌线 a AMAN. 粗肌丝 细肌丝 M线横切面H带横切面 A带横切面带横切面
1.2 The structure of skeletal muscle fiber under EM 1.2.1 Myofibril: myofilament（肌丝） （thick myofilament and thin myofilament) (1) Arrangement：
(2)Molecular structure of myofilament 1) Thick myofilament: Myosin(肌球蛋白) Myofibril a PUUUU H zone Myosin tail (c)Thick filaments (d)My osin molecule
(2) Molecular structure of myofilament 1)Thick myofilament: Myosin（肌球蛋白)
2) Thin myofilament: actin(肌动蛋白) tropomyosin(原肌球蛋白) and troponin(肌钙蛋白) Active site Nebulin G actin molecules Z line Actinin lF strand Tropon (a)Z line and thin filaments (b)Thin filament Sard Myofibril N EnAn H Zor
2)Thin myofilament: actin(肌动蛋白), tropomyosin(原肌球蛋白) and troponin(肌钙蛋白)