Which statement best describes the musculoskeletal system's role?

• A. Maintains body temperature
• B. Regulates hormones
• C. Transmits nerve signals
• D. Protects organs and supports the body

Answer: (D)

The musculoskeletal system provides structure, protection, and a framework for movement. Bones and joints form the body's framework, supporting posture and weight, while protecting vital organs (like the skull protecting the brain and the rib cage protecting the heart and lungs). Muscles attach to bones and contract to produce movement across joints. This combination—supporting the body and shielding organs—best describes its role. The other options relate to the nervous system (transmitting signals), the endocrine system (hormone regulation), or thermoregulation (temperature control by the skin and other mechanisms), which are not the primary functions of the musculoskeletal system.