1. Chapter 6 Wordbytes 1. Cut- = skin 2. Derm- = skin 3. Epi- = upon 4. Follic- = small bag 5. Hypo- = under/below 6. Kerat- = horn 7. Melan- = black 8. Pil- = hair 9. Seb- = grease 10. Sub- = under

2. Unit 3 The Skinny of Skin: Integumentary System Essential question: What is the purpose of the structures that make up our "skin-deep beauty"?

3. Information Learning Target: I will identify the basic parts of the integumentary system and explain the purpose of the Integumentary system Aim: What is skin made of and what is it good for?

4. Information Real-World Connection: Your skin! Vocabulary: integumentary system, epidermis, dermis, hypodermis, subcutaneous layer, pore, sweat gland, sebaceous (oil) gland, arrector pili, blood vessel, nerve, adipose tissue, hair follicle

5. Your skin! The skin is an organ system called integumentary system Facts: Makes up 16% of total body weight Largest organ system of body

6. Parts of skin system Parts of Integumentary System: 1. Skin 2. Hair 3. Nails 4. Sweat glands 5. Oil glands

7. Functions of skin Function of Skin: 1) Control body temperature Structures in the Skin that do this Function Sweat glands Example of this Function sweating

8. Functions of skin Function of Skin: 2) Protecting body from physical and chemical damage Structures in the Skin that do this Function Dermis and epidermis Example of this Function Skin being shield between outside world and internal organs

9. Functions of skin Function of Skin: 3) Producing Vitamin D to make strong bones Structures in the Skin that do this Function epidermis Example of this Function Skin exposed to sunlight  produces Vitamin D  helps our blood absorb more calcium from our food

10. Functions of skin Function of Skin: 4) Feel pain, pressure, and temperature Structures in the Skin that do this Function Nerve tissue Example of this Function When you touch something, nerves of skin sense environment

11. Parts of skin The skin is made of three layers: 1. Epidermis a. Upper epidermis b. Lower epidermis 2. Dermis 3. Hypodermis (subcutaneous layer)

12. epidermis Structure: Epidermis Made up of Living cells & dead cells Function Protect tissue and organs underneath from damage Prefix/Suffix Epi = upon Derm = skin

13. upper epidermis Structure: Upper Epidermis Made up of Dead flattened skin cells; keratin Function protects the living cells underneath from bacteria, heat and chemicals. Prefix/Suffix Epi = upon Derm = skin (Upper epidermis = outer outer skin)

14. Lower epidermis Structure: Lower Epidermis Made up of Living cells; melanin Function (1)To replace the dead cells in upper epidermis (2)Protect skin from sun damage Prefix/Suffix Epi = upon Derm = skin (Lower epidermis = lower outer skin)

15. dermis Structure: Dermis Made up of Collagen & elastic fibers Function (1)Support epidermis (2)Hold organs like blood vessels, nerves endings, hair follicles and oil and sweat glands. Prefix/Suffix Derm = skin

16. hypodermis Structure: Hypodermis (subcutaneous layer) Made up of Adipose (fat) tissue Function Stores fat Prefix/Suffix Hypo = under, below sub = under Cut = skin

17. more parts: PORES. Structure: pores Made up Of Tiny openings on top of skin with sweat & oil glands Function Let sweat and oil come out of skin

18. Sweat gland. Structure: Sweat gland Made up Of tubules Function Cool surface of skin to decrease body temperature

19. Oil gland. Structure: Oil gland Made up Of Fats & proteins Function (1)Protect body against germs (2)Prevent hair and skin from drying

20. Arrector pili. Structure: Arrector pili Made up Of Muscles attached to hair Function makes the hair on a person’s arm stand up to keep them warmer

21. Blood vessel. Structure: Blood vessels Made up Of Arteries and veins Function provide nutrients to the skin and help regulate body temperature

22. nerve. Structure: nerve Made up Of Sensory receptors Function Sense change and detect information about outside environment

23. Adipose tissue. Structure: Adipose tissue Made up Of fat Function (1) insulate the body from heat and cold (2) provides protective padding (3) an energy storage area

24. Hair follicle. Structure: Hair follicle Made up Of hair Function (1) regulating body temperature (2) providing protection from injury (3) increase sensation (4) produce hair