1. Sponge: Set up Cornell Notes on pg. 35 Topic: 6
Sponge: Set up Cornell Notes on pg. 35 Topic: 6.2 Layers of the Skin Essential Question: If skin cells are constantly dying and shedding, how come a tattoo does not eventually shed off?
Layers of the Skin
2.1 Atoms, Ions, and Molecules
If skin cells are constantly dying and shedding, how come a tattoo does not eventually shed off?
Text: P

2. Ch. 5
Test review

3. Hyperthermia or Hypothermia
Journal Entry Homework
P. 32
Hyperthermia or Hypothermia
Mrs. McC Signs
Share with your table
Choose the BEST one
Represents the EFFECTS ON THE BODY THE BEST
Choose a reader who will share to class

4. Layers of Skin 1. Epidermis 2. Dermis
The skin includes 2 distinct tissue layers:
1. Epidermis
2. Dermis
-Subcutaneous layer or hypodermis
Lies beneath dermis
NOT a layer of skin

5. Layers of skin

6. Epidermis 1. Epidermis: Made up of stratified squamous epithelium
Lacks blood vessels
Nourished by dermal blood vessels

7. Epidermis
As new cells grow they push old cells farther from nutrient supply and they die
Become keratinized- hardens, becomes waterproof
Eventually shed

8. Thickest on palms and soles of feet
Thin everywhere else ( mm thick)
Cell division is higher in areas where skin is rubbed or pressed regularly (Hypothesize why?)

9. Make a picture bubble Map
The Layers of the Human Skin m47s
The Human Skin Animation m7s
Make a picture bubble Map
Add information from the video into your pictures of the layers of the skin
-Layer of dead flat tissue

10. Layers of the epidermis
Stratum corneum- Outermost layer, fully keratinized
Stratum lucidum- Thickened skin of palms and soles (only)
Stratum granulosum- Layers of granular cells that contain fibers of keratin
Stratum spinosum- Limited mitosis
Stratum basale- Deepest layer, undergoing mitosis, contains melanocytes

11. Melanocytes- specialized cells that produce the dark pigment melanin
Provides skin color
Absorbs UV rays
Prevents mutations in the DNA or skin cells and other damaging effects
The more melanin produced the darker the skin

12. 2. Dermis
Binds epidermis to underlying tissues
On average mm thick
Composed of:
Irregular dense connective tissue
Muscle cells
Nerve cell processes
Specialized sensory receptors
Blood vessels
Hair follicles
Glands

13. Tattoos
Ink injected into the dermis
Color is permanent
Dermis cells are not shed!
Tattoo Removal
Lasers shatters ink molecules
Immune system removes debris
Before lasers, tattoos were scraped, frozen, or cut away
PAINFUL!!!!!

14. The Tattoo Removal Process 3m20s

15. Subcutaneous Layer NOT part of the skin
Binds the skin to underlying organs
Insulates
Composed of:
Loose connective tissue
Adipose tissue
Major blood vessels

16. Got Cellulite?

17. Layers of skin

18. Integumentary System Crash Course A+P 8m52s
Take 15 bullets on p. 34