What is the importance of the musculoskeletal system? Why are skeletons and muscles combined into one system?

1. The supporting function is that the bones of the skeleton and muscles form a solid framework that determines the position of the internal organs, which does not give them the ability to move.
The protective function is to protect the internal organs. For example, the rib cage covers the heart and lungs, the airways, the esophagus, and large blood vessels.
Motor function is manifested under the condition of precise interaction of the muscles and bones of the skeleton, because the muscles move the bony levers.
2. Without muscles, the skeleton would not be mobile, and the skeleton without muscles could not have the ability to attach, which would lead to their unnecessary movements.