Muscular System - Muscles convert chemical energy into mechanical energy. B. Skeletal muscles and bones 1. Other muscles may be arranged to perform together in groups to promote same movement.
Sarcomeres contain thick and thin filaments .
Thick filaments are made of many myosin molecules bundled together with their heads facing out. Each sarcomere shortens by a little, but all of them acting together can develop a considerable force. The myosin filaments are arranged such that they partially overlap the actin filaments. Myosin heads on each side point away from the center of the sarcomere. During contraction, the interaction of myosin heads with the actin filaments pulls the thin filaments toward the center of the sarcomere.