• Some bones protect the vital organs. The skull acts as armor for the brain, and the pelvic hones keep abdominal organs from being damaged. The movement of the ribs aids the process of breathing and they also protect the organs of the chest, such as the heart and lungs.
• The bones of the ear help with hearing. They act as amplifiers when sound passes from the outside world through on its way to the brain.
• The bone marrow inside flat bone as the shoulder blades and breastbone a range of blood cells.

THE JOINTS

• A joint is the junction between two or more bones. Some joints are fixed, such as of the skull, while others, such cartilaginous joints between the vertebrae of the spine, have hardly any However, most joints in the both freely and are known as Synovial joints. The ends of the bones meeting at synovial joints are covered with a thin layer of cartilage to stop them grinding against each other. They are lubricated, to allow smooth by a thin layer of fluid called Synovial fluid. The ligaments are strong fibrous strips that hold bones together at the joint them from moving too far apart.