Bone is made of
Living cells and non living calcium compounds
Functions of skeleton
Support , protection , movement
Arm bones
Humerus , radius , ulna
Fused joint
Skulls are immovable
Moveable joints
Contain synovial fluid and are called synovial joints
Examples of synovial joints
Ball and socket (hip/shoulder) and hinge joints (knee/elbow)
Reduce friction
Using cartilage and synovial fluid
Cartilage
Acts as a shock absorber
Ligaments
Join bone to bone
Tendons
Join muscle to bone
Antagonistic muscles
Work opposite each other (biceps , triceps in arm)