1. Integumentary System

2. Function of the skin
Cover and protects from germs, dehydration and injury
It is the first line of defense from illness
Regulates body temperature
Manufactures Vitamin D
Site of many nerve endings
Temporary storage of glucose, fat, water and salt
Protects from UV radiation
Can absorb chemical substances

3. Skin Layers
Epidermis
Dermis
Hypodermis

4. Epidermis Outermost layer of skin, has no blood in it
all dead skin cells, every minute of the day we lose about 30,000-40,000 dead skin cells of the surface of the skin
Protection layer of skin
Melanin is produced here. This is the pigment that gives our skin its color. The more melanin the darker the color. Sunlight stimulates melanin production

5. Dermis True skin and is very vascular and contains pores
Thicker inner layer of skin
Matted masses of connective tissue, elastic fibers, nerve endings, muscles, hair follicles, oil and sweat glands
Contains sensory cell - hot, cold, pain and pressure
Blood vessels regulate the body temp by expanding or contracting
Sebaceous glands lubricate, protect and waterproof the skin
Sweat glands cool and protect the skin
Follicles is where hair grows. Hair that you see is made of dead cells

6. Hypodermis Also known as the subcutaneous layer
Loose connective tissue and FAT, half of the body’s stored fat is here
Connects the integumentary system to the muscles
Insulates
Absorbs shock

8. One Square Centimeter of Skin Contains
3,000,000 cells
10 hairs
1 yard of blood vessels
4 yards of nerves
700 sweat glands
200 nerve endings to record pain
3000 sensory cells at the end of the nerve fibers

9. Fun facts about the skin
It is the larges of the body’s organs
Thickest skin is on the palms of your hands and soles of your feet and the thinnest is the eyelid
A large part of the dust in your house is actually dead skin cells