The bodily system that is composed of skeletal, smooth, and cardiac muscle tissue and functions in movement of the body or of materials through the body, maintenance of posture, and heat production.肌肉系统:由骨骼肌组织、平滑肌组织、心肌组织构成的身体系统,具有使身体移动或传送体内物质、维持姿势或产生热能等功能