1. Skeletal System

2. Parts of the skeletal system
Bone
Cartilage
Cover bones, between bones
Ligaments
Hold 2 or more bones together

3. Functions of the skeletal system
Support
Against gravity
Protect internal organs
Brain, heart, lungs
Provide for movement
Attached muscles move bones
Store minerals
Especially calcium
Blood cell formation
In bone marrow

4. Parts of skeleton Axial skeleton Appendicular skeleton
Skull, ribcage, vertebral column
Appendicular skeleton
Pelvis, arms, legs, hands, feet, shoulder

5. Bone structure Periosteum Tough covering on outside Compact bone
Very dense, in shaft of long bones
Spongy bone
Cushioning part, at ends of long bones
Haversian canals
Place fpr blood vessels to pass
Osteocytes (bone cells)
Osteblasts - build bone
Osteoclasts - break down bone
Bone marrow
Blood cell formation
Matrix
Fills up the space beweeen osteocytes
Made of calcium (strength), collagen (flexibile)

6. Joints Where two or more bones come together Types Immovable
Skull bones
Slightly movable
Vertebrae, pelvis
Freely movable
Ball and socket - shoulder
Pivot - neck
Hinge - knee
Saddle - wrist

7. Joint structure Freely movable joints
Ends of bones are covered by cartilage
Keeps bone from grinding away on each other
Ligaments
Hold bones together
Synovial fluid
Produced by cells in the joint
Lubricates the bones so they can slide past each other

8. Skeletal system disorders
Arthritis
Inflammation of a joint
Osteoporosis
Brittle bones
Results from loss of calcium
Breaks
These heal in a series of steps