1. Skeletal System

2. Fun Facts Babies have more bones than adults!
Both Humans and giraffes have the same amount of bones in their necks.
Human thigh bones are stronger than concrete.
Your ribs move about 5 million times a year, everytime you breathe!
One quarter of the bones in your body, are in your feet!

3. Functions Support the body Protect organs Allow movement
Store minerals
Blood cell formation

4. Types of Joints Immovable Slightly movable Freely movable
We have over 230 moveable and semi-movable joints in our body.

5. Immovable Joints Joints connect bones without allowing any movement.
Skull and Pelvis

8. Slightly Movable
The bones are attached by cartilage. These joints allow for a little movement.
Spine and Ribs

11. Freely movable
Cavities between bones are filled with synovial fluid. This fluid helps lubricate and protect the bones.
Ball and Socket
Hinge
Pivot
Saddle

12. Ball and Socket Hips Shoulders
They allow you to swing your arms and legs in many different directions

13. Hinge
Open and close like a door
Elbow and knee
Animation

14. Pivot
Rotation of one bone around another
Neck and Elbow

15. Saddle
This type of joint allows for back and forth and side to side motion but limited rotation.
Thumb

16. If you are "double-jointed", it just means that you have extra long ligaments in your joints and can bend them farther than usual.