1. Get paper in tray Text: P. 171-174
Sponge: Set up Cornell Notes on pg. 29 Topic: 6.1 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?
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Text: P

2. Objective
Students will understand the structure of the layers of the skin
Students will

3. Chapter 6 Integumentary System---Skin
Functions of the Integumentary System
Maintains homeostasis
Regulates body temperature
Protective covering
Prevents microorganisms from entering the body
Retards water loss
Houses sensory receptors
Contains immune system cells
Synthesizes chemicals
Excretes small amounts of waste

4. Two or more kinds of tissue grouped together and performing specialized functions= organ
The skin is the largest organ in the body by weight

5. Skin cells
Skin cells: help produce Vitamin D needed for normal bone and tooth development
Some cells (keratinocytes) produce substances that simulate development of some WBCs

6. Layers of Skin 1. Epidermis 2. Dermis
The skin includes 2 distinct tissue layers:
1. Epidermis
2. Dermis
-Subcutaneous layer or hypodermis

7. Layers of skin

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

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

10. Hypothesize the place(s) on your skin that are the thickest AND why.
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

11. 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

12. 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- Thickest layer, Limited mitosis
Stratum basale (bă-sail-ē)- Deepest layer, undergoing mitosis, contains melanocytes

13. 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
Mel-ano-cytes
The more melanin produced the darker the skin

14. 2. Dermis: Binds epidermis to underlying tissues
Composed of:
Dense connective tissue (irregular)
Muscle cells
Nerve cell endings
Specialized sensory receptors
Blood vessels
Hair follicles
Glands (sweat/oil)

15. 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!!!!!

16. The Tattoo Removal Process 3m20s

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

18. Layers of skin

19. Integumentary System Crash Course A+P 8m52s
Take 15 bullets on p. 28