1. Integumentary (Skin) System
The largest organ in the human body

2. Functions 1.Covers and protects to prevent the loss of water.
2.Regulate body temperature.
3. Eliminate wastes
4. Gather information about the environment.
5. Produce vitamin D
6. Protects the body from injury and infection

3. Homeostasis
The skin helps the body maintain homeostasis, or stable internal conditions, by ……
keeping body temperature steady in spite of changing external conditions.

5. 3 Layers of Skin

6. Parts of the Skin Epidermis- Outermost & thinnest layer of the skin
Does not contain nerves or blood vessels
Contains dead cells that last for 2 weeks
Melanin is a pigment that gives the skin its color

7. Parts of the Skin Dermis Middle & Thickest layer of skin
Contains blood vessels and nerves
Sweat glands produce perspiration through pores
Follicles where strands of hair grow
Oil glands waterproof the hair to keep the skin moist

8. Dermis Top layer arranged in ridges.
Ridges help the epidermis bind to the dermis.
The uneven ridges create __________!
Dermis

9. Parts of the Skin Fat Layer (Subcutaneous)
Pads the internal organs and helps keeps body heat

11. Layers of the Skin
Print this out for the foldable

12. What are Nails?
Nails – protective covers of ends of fingers and toes.

13. Disorders of the Skin
Nail Fungus

14. Disorders of the Skin
Fungal infections
Ring Worm
Athlete’s Foot

15. Disorders of the Skin
Impetigo – bacterial infection

16. Disorders of the Skin Warts- viral infection Common wart Plane warts
Plantar wart

17. Disorders of the Skin
Psoriasis – chronic inflammation

18. Interesting Tidbits
Your body is composed of approximately 100 Trillion cells
About 16% of your body weight is skin
The skin is completely renewed every 27 days
You will make almost 1000 new skins in a lifetime
If all the layers of your skin were laid out on the ground, it would cover about 20 m2 or 2 parking spaces

19. Interesting Tidbits
A fingernail or toenail takes about 6 months to grow from base to tip
Fingernails grow faster than toenails
An average human scalp has 100,000 hairs
We lose between 40 and 100 hairs per day
Blondes have more hair than brunettes