What body system is made up of bones, joints, and muscles, and protects the body and enables motion?

• A. Nervous system
• B. Musculoskeletal system
• C. Endocrine system
• D. Integumentary system

Answer: (B)

The musculoskeletal system, made up of bones, joints, and muscles, provides the framework that supports the body, protects vital organs (like the skull protecting the brain and the rib cage safeguarding the heart and lungs), and enables movement. Bones give structure and protection; joints allow different movements and flexibility; muscles contract to pull on bones via tendons, producing motion. While the nervous system, endocrine system, and integumentary system play important roles in protection, signaling, and other functions, they do not describe a system whose primary composition is bones, joints, and muscles or whose main job is enabling movement.