Which system supports the skeletal system and enables movement of various body parts?

The correct answer is the Muscular System, which plays a crucial role in supporting movement throughout the body. The muscular system consists of all the muscles in the body that work in conjunction with the skeletal system to produce movement. Muscles contract and relax, pulling on the bones to enable various actions, whether it's walking, lifting, or even simple gestures like waving.

Additionally, the muscular system is vital for maintaining posture and stabilizing joints, thereby directly supporting the skeletal system's function. This collaboration between muscles and bones allows for a wide range of movements, making the muscular system essential for physical activity and overall mobility.

While the other systems mentioned play significant roles in the body, they do not primarily facilitate movement in the way that the muscular system does. The nervous system is crucial for sending signals and coordinating actions, the respiratory system focuses on breathing and gas exchange, and the circulatory system is responsible for transporting blood and nutrients. Each of these systems is important, but their primary functions do not involve the direct facilitation of movement like the muscular system does.