1. 6.2 Accessory Structures of the Skin
Sponge: Set up Cornell Notes on pg. 31 Topic: 6.2 Accessory Structures of the skin Essential Question: What is the major function of the accessory structures of the skin? Text:
6.2 Accessory Structures of the Skin
2.1 Atoms, Ions, and Molecules
What is the major function of the accessory structures of the skin?
Get both papers from tray

2. Homework Children die after being left in hot cars
ONLY ANSWER Questions 4-8
HL answers to questions as you read

3. Objective
Students will understand the functions of the accessory structures of the skin
Students will create a tree-map comparing the functions of each type of accessory structure

4. 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

5. 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

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

7. Hair Follicles and Hair
Pg. 31
Accessory Structures of the Skin
Hair Follicles and Hair
Nails
Glands

8. Hair Follicles + Hair Hair follicles:
Composed of living epidermal cells
Hair follicles present on MOST skin surfaces
Everywhere EXCEPT: Palms/soles/lips/nipples/parts of reproductive organs
Hair:
Composed of dead epidermal cells

9. Hair Color Genes determine hair color
Based on amount of melanin that melanocytes produce

10. Hair Loss We lose from 20-100 hairs a day
Baldness: occurs when lost hair is not replaced
Genetic
X linked gene
More frequent in males
Look at your mother’s father. Is he bald? That may be your fate. 

11. Functions of Hair
With your table: Hypothesize what the function of each type of hair is.
Hair’s Functions:
Protection
Warmth
Touch Sense
Eyelashes and Eyebrows:
Protect eyes from dirt, sweat, rain etc.
Hair on head:
Protection from sun
Hair in nose/ears:
Keep foreign objects out

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

13. Extreme curvature
Bluish
Horizontal Furrows

14. Sebaceous Glands
Sebaceous glands: Produce sebum (oil), which is secreted into follicles through ducts
Keep skin and hair soft and waterproof
Acne results from excess sebum secretion

15. Sweat Glands Sweat glands: are widespread in skin Mostly water
Some salt
Some waste
Two types:
Eccrine
Apocrine

16. Eccrine sweat glands:
Most numerous
Respond primarily to temperature change
Also in palms/soles and release sweat when emotionally distressed
Apocrine glands- develop a scent as they are metabolized by skin bacteria
Become puberty
Also active during sexual arousal

17. Integumentary System: Crash Course A+P 9m18s
15 bullets on p. 36

18. Children Die After Being Left in Hot Cars
Directions: Read the article. HIGHLIGHT the answers to these questions as a way to “prove” your answer.
Use article to answer 4-8
Don’t answer 1-3 until tomorrow’s notes
DUE TOMORROW

19. With your table: Hypothesize the differences between human and chimp hair.
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

20. 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

21. Lose the fur….loose the parasites
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