Bone
Bones provide the structure for our bodies. The adult human skeleton is made up of 206 bones. These include the bones of the skull, spine (vertebrae), ribs, arms, and legs. Bones are made of connective tissue reinforced with calcium and specialized bone cells. Most bones also contain bone marrow, where blood cells are made. Bones work with muscles and joints to hold our body together and support freedom of movement. This is called the musculoskeletal system. The skeleton supports and shapes the body and protects delicate internal organs such as the brain, heart, and lungs. Bones contain most of our body’s calcium supply. The body is constantly building up and breaking down bone tissue as required. Healthy bone needs a balanced diet, regular weight-bearing exercise, and the right levels of various hormones. The skeleton The human skeleton is made up of 206 bones, including bones of the: Skull – including the jaw bone Spine – cervical, thoracic and lumbar vertebrae, sacrum, and tailbone