Which structure is composed of the filaments actin and myosin?

Question

fascicle

myofibril

muscle fiber

sarcomere

Answer 1

Actin and myosin proteins form filaments arranged in the myofibrils in a longitudinal manner. The main difference between actin and myosin is that actin forms a thin filament whereas myosin forms a thick filament. The sliding over of the two filaments over one another in a series of repetitive events leads to the contraction of the muscles.