1. The Skeletal System

2. What the Skeletal System Does
Your skeleton has four major functions.
Protects organs
Shape and support
Movement
Stores minerals and other materials until your body needs them.
Produces blood cells

3. Shape and Support The backbone, or vertebral column
is the center of the skeleton.
26 small bones
vertebrae, make up your backbone
Is flexible and able to bend

4. Movement and Protection
Most of the body’s bones are associated with muscles.
The muscles pull on the bones to make your body move
Bones also protect many of the organs in your body.
Touch your head, your skull protects your brain

5. Production and Storage
Storage of minerals released by the bones when your body needs it.
Like calcium and phosphorus
Some of your bones produce substances that your body needs.
New blood cells

6. Types of Bone The hard outer layer of bone is the COMPACT BONE
The interior region of bone that contains many tiny holes is the SPONGY BONE

7. Joints of the Skeleton
A joint is a place in the body where two bones come together.
A joint allow bones to move in different ways.
Some joints do not move and are called immovable joints, like in your skull.
Some joints do move and are called moveable joints.

8. How do joints move? Ligaments Cartilage Strong connective tissue
Hold bones together
Cartilage
Connective tissue more flexible than bone
Covers the ends of bones and keeps them from rubbing against each other.

9. Pivot Joint
Located between the first two vertebrae in your neck, enabled you to shake and nod your head. It allows for rotation of one bone around another.

10. Hinge Joint
The elbow and knee are hinge joints. This allows for movement in a forward and backward direction and also a little side to side.

11. Ball and Socket Joint
Ball and socket joints provide for the circular motion of bones, consist of a bone with a rounded heard that fits into the cuplike pocket of another bone. Your hip and shoulder are ball and sockets.

12. Gliding Joint
The gliding joint in your wrist or ankle enables you to bend and flex as well as make limited side-to-side motions.

13. Bone Diagram