filament Myosin 收缩过程 head Mvosin thick filament Thin filaments Thick filament Extended muscle ADP ATP P d (a) Dissociation of actin-myo Head returns to -H zone original conformntion. A band causing aliding motion Sarcomere E89989888992288 9e682982 ATP Contracting muscle Sdiitergimto-ei —A band H2O Sarcomere- b) associntion of Hydrolywis myosin head of ATP by with actin myoain head Contracted muscle 或2 A band —Sarcomere 肌收缩过程