1. It’s all about the bones!!!
Skeletal System
It’s all about the bones!!!
Information taken from:

2. 1. FYI 5 Cool Facts about the Skeletal System
20% of your body weight is bone
Do the math
(Your body weight) X .20= the weight of your bones
There are 30 bones in your skull
You have 206 bones
More than ½ of these are in your hands and feet
Your largest bone is your femur and your smallest bone is in your Ear!

3. 2. Functions of the Skeletal System
Provides shape and support
Enables you to move (works with muscles)
Protects internal organs
Produces blood cells
Stores materials for future use (HOMEOSTASIS ALERT!)

4. 3. Shape and Support Provides Shape and Support for Body
Shape depends on the organ/organ system it needs to protect
Example:
Skull thick and round to cover brain!

5. 4. Protects Internal Organs
Protect your internal organs
Organs can be easily squished
Example:
Heart and breastbone
Lungs and rib cage
Spinal cord and spine

6. 5. Produces Blood Cells Produces substances our body needs
Blood cells (white and red) made in the marrow of the long bones of the arms and legs
Bone Marrow

7. 6. Stores Materials for Future Use
Compact bone – where blood vessels are and minerals are stored
Stores substances until your body needs them
Stores calcium and phosphorus
Homeostasis alert!
Bones release small amounts of Calcium and phosphorus into body when body is running low!

8. 7. Enables you to move
Muscles work with bones to make you move

9. 8. Joints of the Skeletal System
The bones of the skeletal system are connected at areas called joints
Where two or more bones come together
The body has moveable and immoveable
joints

10. 9. Immovable Joints Skull Ribs Examples:
Joints in the body where there is little or no movements
Examples:
Skull
Ribs

11. 10. Movable Joints Joints that allow movement.
Most of the joints in the body are movable.
There are 4 types of movable joints:
Hinge
Ball and Socket
Gliding
Pivot

12. 11. Movable Joints of the Skeletal System
Ball and Socket Joints
Allows fullest range of motion
Examples: shoulder and hip

13. 12. Movable Joints of the Skeletal System
Pivot Joints
Allows one bones to rotate around another
Example: neck vertebrae

14. 13. Movable Joints of the Skeletal System
Hinge Joints
Allows forward and backward motion
Example: knee and elbow

15. 14. Movable Joints of the Skeletal System
Gliding Joints
Allows one bone to slide over another
Example: wrist and ankle

16. 15. Joints of the Skeletal System
Bones in movable joints are held together by strong connective tissue called ligaments.
Ligaments are like the “tape” that holds bones together.

17. CPS Quiz
Skeletal System

18. 1. What is a place in the body called where two bones come together?
Connections
Hinge
Joint

19. 2. Which type of joint allows the bone to swing in a full circle?
hinge
Ball and socket
Pivot
gliding

20. 3. Do bones make blood cells?
A. Yes
B. No

21. Cartilage Tendon ligament
4. What is the name of the tissue that holds bones together at a joint?
Cartilage
Tendon
ligament

22. 5. What do your bones store (but not produce) that your body needs?
Phosphorus
White blood cells
Red blood cells