What does the musculoskeletal system include?

The musculoskeletal system comprises bones, joints, and muscles, which work together to support the body, facilitate movement, and protect internal organs. Bones provide structure and protection, joints allow for movement and flexibility, while muscles enable motion by contracting and relaxing. This synergy is crucial for maintaining posture, enabling locomotion, and performing everyday activities.

The other choices are limited in scope. For instance, if the focus were solely on bones and joints, it would overlook the essential role of muscles in movement. Additionally, a description that includes only muscles and ligaments fails to encompass the supportive structure provided by bones and joints, which are vital to the system's overall function. Lastly, referring to only the framework of the body does not capture the dynamic aspect of the musculoskeletal system, which involves muscle actions necessary for movement. Therefore, the comprehensive nature of bones, joints, and muscles makes the chosen answer the most accurate representation of the musculoskeletal system.