Bones, joints and muscles

The Skeleton.....

• Supports

• protects

• allows us to move

The joints

• Bones are attached to other bones by slightly elastic ligaments.
• A layer of cartilage prevents wear of the surfaces in contact.
• A small amount of fluid called synovial fluid helps to also reduce friction

The muscles

Bending the arm - Biceps contract and triceps relax

Straightening the arm - Biceps relax and triceps contract.