Skeletal muscles play a huge role in how our body functions because without muscles, our bones would not be held together properly. Most of the muscle tissue in the body is skeletal muscle. It interacts with the skeleton to move body parts. Its long, thin cells are called fibers and have more than one nucleus. Their structure gives them a striated appearance. The muscles are considered voluntary, meaning that contractions can be controlled. A skeletal muscle contains bundles of muscle cells. Inside each cell there are thread-like myofibrils, divided into sarcomeres, the unit of contraction. They are tied together by connective tissue that extends beyond to form tendons. A tendon is a band of dense connective tissue that connects a muscle to a bone. Tendons make joints more stable by keeping adjacent bones properly aligned. The human body has more than six hundred skeletal muscles. One end of the muscle is called the origin and remains relatively still during contractions. The other end is called insertion. It is attached to a bone that moves mainly during contractions. When a skeletal muscle contracts, it pulls on the bone to which it is attached. Because skeletal muscle exerts force only when it contracts, a second muscle, a flexor, is needed to flex or bend the joint. The muscles attach very close to the muscle joints and are arranged in pairs or groups. Some muscles work in mutual innervation or opposition. That is, when one muscle is stimulated, no signal is sent to the other group. Therefore it does not contract. Other muscles work in a synergistic role. That is, it supports and the contraction adds strength or helps stabilize another muscle. The body has two bases...... in the center of the card ......the character plays a boy suffering from Duchenne muscular dystrophy who is sent to live at the Carrigmore residential home for the disabled. He can only move his right hand, but makes friends with his roommate, who has cerebral palsy. In conclusion, the constitution of our body depends on the health and stability of the muscular system and, above all, on our skeletal muscles. Without these muscles, our bodies would not be able to move and contract, which causes some of our daily movements, such as bending and walking. Our bodies are actually more delicate than you think. We were taught that our bodies are strong and that nothing can stop us. In fact, a single muscle can cause our entire body to shrink, proving the invalidity that our bodies are invincible. We must therefore learn to take care of our entire body, not only the outside, but also the inside.