1. Do now activity #1 What are the 2 MAJOR layers of skin?
What is the subcutaneous layer called? What is it composed of?
What are the 4 types of epidermal cells?
What are the parts of the integumentary system?
Name a physiological function of the integumentary system.

2. chapter 5-2: Skin, Hair, & nails
Essential Question:
Identify 2 different skin appendages and explain how they protect the body.
chapter 5-2: Skin, Hair, & nails
Learning Target
Explain what contributes to skin color.
Identify skin appendage.
Describe the types of sweat glands.
Describe the function of sebaceous glands (oil gland).
Describe the structure and function of hair.
Describe the function of the nails.

3. announcements Chapter 1 Retake (>70%)
Completed stamp sheet assignments
Retake score will be permanent
Class website will be updated today
Refer to stamp sheet for list of assignments
Quiz 1 scheduled for: Wednesday, 9/19/18
Quiz 2 scheduled for: Thursday, 9/20/18
Chapter 5 Test scheduled for: Tuesday, 9/25/18
Last Day to Stamp Chapter 5: Monday, 9/24/18

4. Available Extra Credit
announcements
Available Extra Credit OR
Tissue/Pencil Box = 5 Point Class Pass (Limit 2 per student per chapter)

5. Don’t forget to chunk your notes!

6. Three pigments contribute to skin color.
Skin color: pigments
Three pigments contribute to skin color.

7. Skin color: pigments Melanin
Yellow to reddish-brown to black pigment, responsible for dark skin colors
Freckles and pigmented moles (result from local accumulations of melanin)

8. Skin color: pigments Carotene
Yellow to orange pigment, most obvious in the palms and soles of the feet

9. Reddish pigment responsible for the pinkish hue of the skin
Skin color: pigments
Hemoglobin
Reddish pigment responsible for the pinkish hue of the skin

10. Don’t forget to chunk your notes!

11. Skin appendages
Skin appendages are parts of the integumentary system that come from the epidermis .

12. Skin appendages
Skin appendages include the glands (sweat and oil), nails, hair and hair follicles.

13. Don’t forget to chunk your notes!

14. True glands prevent overheating of the body
Sweat glands
True glands prevent overheating of the body
Eccrine Sweat Glands: found in palms, soles of the feet, and forehead
Apocrine Sweat Glands: found where arms and legs connect and anogenital areas

15. Modified glands secrete wax and milk
Sweat glands
Modified glands secrete wax and milk
Ceruminous Glands: in external ear canal that secrete cerumen (wax)
Mammary Glands: specialized glands that secrete milk

16. Don’t forget to chunk your notes!

17. Sebaceous Glands (oil glands)
Sebaceous glands are simple glands found all over the body

18. Sebaceous Glands (oil glands)
They secrete an oily secretion called sebum

19. Sebaceous Glands (oil glands)
They soften skin when stimulated by hormones

20. Sebaceous Glands (oil glands)
They prevent water loss (water proofs skin)

21. Don’t forget to chunk your notes!

22. hair
Hair is a filamentous strand of dead keratinized cells produced by hair follicles
Hair contain hard keratin which is tougher and more durable than the soft keratin of the skin
Made up of the shaft projecting from the skin, and the root embedded in the skin
Pigmented by melanocytes at the base of the hair
The follicle surround the shaft and extends into the dermis

23. hair Functions of hair include: Helping to maintain warmth
Alerting the body to presence of insects on the skin
Guarding the scalp against physical trauma, heat loss, and sunlight

24. hair Alopecia: hair thinning in both sexes True, or frank, baldness
Genetically determined and sex-influenced condition
Male pattern baldness – caused by follicular response to DHT

25. Don’t forget to chunk your notes!

26. Nails
Scale-like modification of the epidermis on the distal, dorsal surface of fingers and toes (digits)
Protects the ends of the digits