1. Bones, Muscles & Skin

3. Functions of the Skeletal System
Shape & support
Movement
Protects organs
Produces blood cells
Stores minerals

4. Two Parts: Axial: Skull & vertebral column 2. Appendicular: appendages
(arms, legs, hips & shoulders)

5. Joints: Any place where two or more bones come together.
4 types:
1. hinge- forward & backward (knee)
2. Ball & Socket- greatest range of motion- hip & shoulder
3. Pivot: one bone rotates around another- neck
4. Gliding: one bone slides over another- wrist & ankle

7. Ligaments: Hold bones together at joints
-end of the bones covered in cartilage to keep them rubbing together

8. Human Skeleton

9. Muscular System About 600 muscles in the human body Two Main types:
Involuntary: you can not control them
Voluntary: you can control them

10. Three types of muscle tissue:
Cardiac: only in the heart, involuntary, striated, always working
Skeletal: attached to bones by tendons, voluntary, striated, tires easily
Smooth: involuntary, not striated, usually lines the insides of your organs

11. Types of muscle tissue:

12. How do muscles work? Muscles can only contract
In order for movement to occur muscles must occur in pairs- one contracts while the other relaxes

14. Skin
Largest organ in the human body- spread out- covers 1.5 meters square
Functions:
Protection
Maintain temperature
Eliminate wastes
Gather information
Produce vitamin D

15. Skin has two layers:
Epidermis
Dermis
Under the skin is a layer of fat

16. Epidermis Top layer Mostly dead skin cells Protects the under layers
Thinner than the dermis
No nerves or blood vessels
Does contain melanin-pigment that gives skin it’s color

17. Dermis Thicker, underneath layer Contains: Blood vessels Nerves
Sweat glands
Oil glands
Hair follicles

18. Caring for Your Skin Eat a healthful diet & drink plenty of water
Keep your skin clean using mild soap
Limit sun exposure