the body through nervous system.8 smooth and cardiac muscles. It , maintains posture, and circulates blood throughout the body. The muscular system in vertebrates is controlled through the nervous system, although some muscles (such as the cardiac muscle) can be completely autonomous. Together with the skeletal system it forms the musculoskeletal system. do you know that the diaphragm is a muscle? did you know that the muscles hold the body together ? did you know that the muscle are in change of the movement through out your body ? without your muscles you can't move without your muscles