Which system includes bones, muscles, and joints?

The Musculoskeletal System is the correct answer because it specifically encompasses bones, muscles, and joints, which work together to provide structure, support, and movement to the body. The bones form the skeleton, which provides a rigid framework, while muscles are responsible for producing movement through contraction. Joints are the points where two or more bones meet, allowing for flexibility and motion.

In contrast, the Nervous System primarily involves the brain, spinal cord, and nerves, which are responsible for transmitting signals throughout the body and coordinating responses to stimuli. The Endocrine System involves glands that produce hormones to regulate various bodily functions but does not include bones or muscles. The Circulatory System consists of the heart and blood vessels, focusing on the transportation of blood, nutrients, and gases rather than the structures associated with movement. Thus, the Musculoskeletal System is uniquely characterized by its components that facilitate physical activity and support the body's architecture.