1. Hypo/Hyperthermia Writing Turn to p. 40 Signature needed 1

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

3. 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. 3 P. 41 Share with your Table

4. Sponge: Set up Cornell Notes on pg. 45 Topic: 6.3 Accessory Structures of the skin Essential Question: What is the major function of the accessory structures of the skin? 2.1 Atoms, Ions, and Molecules 6.3 Accessory Structures of the Skin Journal Writing Due TODAY What is the major function of the accessory structures of the skin?

5. Accessory Structures of the Skin 5 Originate from hair follicles As long as accessory structures remain intact, severely burned or injured dermis can regenerate

6. Accessory Structures of the Skin Hair Follicles and Hair Nails Glands Pg. 45

7. 7 Hair Follicles Composed of living epidermal cells Lose 20-100 hairs a day Hair present on all skin surfaces except: palms/soles/lips/nipples/parts of reproductive organs Epidermal cells divide and grow Pushed toward surface Die Hair=dead epidermal cells

8. 8 When hair is not replaced= baldness Genetic X linked gene More frequent in males Look at your mother’s father. Is he bald? That may be your fate.  Genes determine hair color by directing the type and amount of pigment that epidermal melanocytes produce

9. 9 Hair’s Functions? Warmth Protection Touch Sense Eyelashes and Eyebrows? Protect eyes from dirt, sweat, rain etc Hair on head? Protection from sun Other hair on body Touch sense warmth

10. 10 Human Hair vs Chimp Hair Appearances can be deceiving! We have the same amount of hair per square inch as a chimpanzee Our hair is just shorter, thinner, and lighter

11. 11 Lanugo (La-new-go) and Hypertrichosis (Hyper-trick-o-sis) Babies are covered with lanugo while in the womb, some babies are born with a thin layer still visible In a very rare disorder called hypertrichosis- the lanugo remains and grows long

12. 12 Our hair persisted in places where our individual scents cling “Parasite-reduction hypothesis” Fur entraps fleas, lice and ticks Which spread diseases Lose the fur….loose the parasites

13. 13 Nails Protective coverings on fingers and toes Specialized epidermal cells Mirrors health Bluish= circulation problem Horizontal furrows= period of serious illness/malnutrition Certain disorders may lead to extreme curvature of the nails Ex: Cystic Fibrosis

14. 14 Extreme curvature Bluish Horizontal Furrows

15. 15 Skin Glands 1.Sebaceous Glands 2.Sweat Glands

16. 16 Sebaceous Glands Usually associated with hair follicles Produces fatty material called sebum which is secreted into follicles through ducts (OIL!!!) Keep skin and hair soft and waterproof Acne results from excess sebum secretion

17. 17 Sweat Glands Widespread in skin Consists of tiny tube that originates as a ball shaped coil in the deeper dermis Lined with sweat secreting epithelial cells

18. 18 Most numerous= eccrine glands Respond primarily to temperature change Also in palms/soles and release sweat when emotionally distressed Sweat= mostly water, some salt, some waste Apocrine glands- develop a scent as they are metabolized by skin bacteria Become active @ puberty Also active during sexual arousal in groin/nipples

19. 19 Clinical Application 6.2/6.3 Read Clinical Application 6.2/6.3 and answer the questions HIGHLIGHT the answers to the questions in the reading as a way to provide evidence for your answer P 178/181 in text

20. 20 Clinical Application 6.3 Acne Vulgaris most common skin disorder sebum and epithelial cells clog glands produces whiteheads and blackheads anaerobic bacteria trigger inflammation (pimple) largely hormonally induced androgens stimulate sebum production treatments include antibiotics, topical creams, birth control pills