1. Chapter 15 Lesson 1 Integumentary System

2. Functions of the Skin
Your skin is the primary organ of your Integumentary system
This system includes, Skin, Hair, nails, Sebaceous glands, Sweat glands

3. Functions of the Skin Skin Provides these vital functions
1. Providing a protective covering for your body
- Skin acts as a barrier between your internal organs and the outside world
- shields from injury, pathogens, ultraviolet rays
- Helps maintain the body’s balanceof fluid and electrolytes

4. Functions of the Skin 2. Regulating body temperature
- Helps keep body temperature constant
- When body hot, tiny blood vessels enlarge permitting heat to escape (radiation)
-Sweat glands become active, releasing perspiration, which cools the skin, dropping the body temperature

5. Functions of the Skin 3. Enabling you to sense the world around you
- Skin is a major sense organ that serves as a means of communication with the outside environment
- Nerve endings in your skin are responsive to touch, pain, pressure, and temperature

6. Structure of the Skin Skin Has 2 main layers
Epidermis – The outer, thinner layer of skin
Dermis – The thicker inner layer

7. Epidermis Made up of both living and dead cells
Form a tough protective coating
Epidermis contains a fatty substance called lipids that makes the skin waterproof
When dead cells shed replaced by new cells
Some cells produce Melanin – Pigment that gives skin, hair, eyes their color
The more Melanin the greater protection from the sun and ultraviolet rays that have been connected to cancer

8. Dermis Made up of connective tissue that gives the skin its elasticity
Nerve endings and hair follicles extend into the dermis
So do the sweat glands and sebaceous glands
Below the dermis is tissue called the hypodermis. It is not part of your skin, but it attaches the skin to bone and muscle

9. Skin Care

10. Skin Care
Good personal hygiene land a balanced eating style promote healthy skin
Daily washing, bathing, or showering slows the growth of bacteria that causes body odor
Vitamin A helps promote healthy skin
Milk, egg yolks, liver, green leafy and yellow vegatables and yellow fruits

11. Problems of the Skin

12. Ring worm

13. Ring worm
Ring worm is a common fungal infection that affects various parts of the body
It gets its name from the ring shaped, scaly reddened or blistery patches

14. Athletes foot

15. Athletes foot
The same fungus that causes ringworm causes athletes foot
Fungal infection between the toes
Associated with wearing shoes and sweating
Highly contagious

16. Boils

17. Boils
An inflamed, pus filled area of the skin, usually an infected hair follicle
Cause is Staphylococcus aureus
Keeping skin clean helps prevent boils
Never squeeze or burst a boil; this can spread the infection
Boils can be serious and if large, should be treated by a doctor

18. Warts

19. Warts Contagious growths on the outer layer of the skin
Most are painless an harmless, but the virus that causes them can spread to other parts of the body and form more warts

20. Moles

21. Moles
Moles are small, usually round, slightly thickened brown to dark brown spots on the skin
Usually harmless
If mole suddenly appears, grows, bleeds, or changes color, shape consult a physician immediately

22. Psoriasis

23. Psoriasis
Skin disease in which thickened paths of inflamed, red skin form, often covered by white, flaking scales
Should be treated by a physician
Cause not known but can be a lifetime skin problem if not treated

24. Vitiligo

25. Vitiligo Disorder in which patches of skin lose their color
The affected areas are extremely sensitive to sunlight and should be protected
Believed to be an auto immune disorder that causes an absence of the skin cells that produce melanin
No cure, but about 30% of cases the color returns on it own

26. Impetigo

27. Impetigo
A streptococcal infection in which bacteria enter a small break in the skin
This infection is highly contagious

28. Blisters

29. Blisters Raised area filled with a watery fluid
They usually result form the skin being rubbed against the inside of your shoe
Burns may blister also
Keep it from breaking and leave t heal on its own

30. Callus

31. Callus
Area of thickened skin that forms as a result of regular or continued friction
Musicians who play stringed instruments often develop calluses on their fingers
Calluses can be reduced by rubbing them with a porous stone called pumice

32. Corn

33. Corn Callus on toe caused by the pressure of a tight fitting shoe
Spongy corn pads can relieve the pressure that makes corns painful
Wearing shoes that fit properly is the main way to prevent corns