Which components are included in the musculoskeletal system?

The musculoskeletal system is fundamentally composed of components that support movement and provide structural integrity to the body. This includes muscles, which facilitate movement through contractions; bones, which form the rigid framework that supports the body; and joints, which are the points where two or more bones meet, allowing for flexibility and movement.

Muscles enable various types of physical activity while also protecting the bones and supporting posture. Bones serve essential functions beyond just structure; they protect vital organs, store minerals, and produce blood cells. Joints are critical for allowing a range of movements from simple bending to complex motions.

In contrast, the other options describe systems or components that do not belong to the musculoskeletal system. Blood vessels and lymph nodes relate to the circulatory and immune systems; nerves and neurons pertain to the nervous system; and internal organs and glands are part of the digestive, respiratory, and endocrine systems. Understanding the distinct roles of these systems helps clarify why only muscles, bones, and joints are associated with the musculoskeletal system.