Sponge: Set up Cornell Notes on pg. 43 Topic: Ch. 6 Integumentary System: Layers of the Skin Essential Question: If skin cells are constantly dying and shedding, how come a tattoo does not eventually shed off? 2.1 Atoms, Ions, and Molecules 6.3 Layers of the Skin If skin cells are constantly dying and shedding, how come a tattoo does not eventually shed off? Send someone up for the journal writing prompt: Due TOMORROW

Got Extra Credit? Come to Report Card Night This Thursday 2:00-4:00 5:30-8:00

3 Layers of Skin 1. Epidermis 2. Dermis Subcutaneous layer or hypodermis beneath dermis NOT part of skin The skin includes 2 distinct tissue layers:

4 Made up of stratified squamous epithelium Lacks blood vessels is nourished by dermal blood vessels Epidermis

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

6 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?)

7 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

8 Layers of Epidermis stratum corneum stratum lucidum stratum granulosum stratum spinosum stratum basale

9 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 Dermis

10 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!!!!!

11 The Tattoo Removal Process 3m20s

12 Subcutaneous Layer Composed of: loose connective tissue adipose tissue major blood vessels NOT part of the skin Binds the skin to underlying organs Insulates

13 Got Cellulite?

Layers of skin

15 The Layers of the Human Skin 3m47s The Human Skin Animation 1m7s Make a picture bubble Map Add information from the video into your pictures of the layers of the skin -Layer of dead fat tissue

Using the Homeostatic response sheet on Pg. 12… Task: Write a two-three paragraph journal entry on either hyperthermia OR hypothermia. Pretend you are someone suffering from hypothermia or hyperthermia. Please write two-three paragraphs describing your circumstances and the effects hyperthermia or hypothermia is having on your body. Make sure to include these details: Where are you? What are the circumstances that led you to this fate? (Backstory) Explain in detail the physical effects that you are experiencing. 16 P. 40 DUE: Tomorrow Classwork/Homework