The skeletal system consists of bones, bone marrow, tendons, ligaments, and cartilage. It supports the body, protects organs, and works with muscles to enable movement. Common disorders of the skeletal system include osteoporosis, osteoarthritis, scoliosis, spina bifida, Paget's disease, fractures, bone cancer, and kyphosis. The skeletal system works with the muscle system as muscles connect to bones and contract to help the skeleton move. Maintaining skeletal health involves getting calcium, nutrients, and good posture. Alcohol and tobacco can negatively impact the skeletal system by interfering with calcium absorption and making bones more brittle.