The primary functions of the muscular system are the movement of different parts of the body, sitting up correctly, joint safety, heat control, circulation, and digestion but the most important function is body movement. The skeletal muscle, smooth muscle and cardiac muscle are all critical to the human survival for daily living. For one, if our heart stops functioning, we would die. The cardiac muscle (heart) pumps blood through the body. The skeletal muscle is attach to the bones, maintains posture and movement. This muscle is controlled by the part of the brain that is awake. The smooth muscle is involuntary and helps with the movement of food through the digestive
