1. Integumentary System (Skin)

2. What Can You Observe About Skin? Look at the skin on your arms and hands. What does your skin do for your body?

3. Using a hand lens, examine the skin on your hand. Look for pores and hairs on both the palm and back of your hand. What Can You Observe About Skin?

4. Place a plastic glove on your hand. After five minutes, remove the glove. Then examine the skin on your hand with the lens. What Can You Observe About Skin?

5. Think It Over Compare your hand before and after wearing the glove. What happened to the skin when you wore the glove? Why did this happen?

7. Skin The Body’s Largest Organ Includes: - Skin - Hair - Nails

8. Functions of the Skin - 7 major functions

9. Functions of the Skin 1. Covers the body

10. Functions of the Skin 2. Prevents the loss of water

11. 3. Protects the body from infection and injury

12. 4. Helps to regulate body temperature Functions of the Skin

13. 4. Regulation of Body Temperature Blood Vessels expand and constrict - Increased blood flow releases more heat Sweat Glands - Skin has about 3 million - Releases sweat onto skin which has a cooling effect

14. Functions of the Skin 5. Gets rid of waste (sweat)

15. 5. Gets rid of Wastes Sweat - Water - Sodium Chloride (salt) - Urea

16. 6. Receives information from the environment Function of the Skin

17. 6. Sensory Response Nerve cells in the skin detect and relay information about: - temperature - pressure - pain

18. Function of the Skin 7. Produces vitamin D

19. 7. Formation of Vitamin D Produced in the epidermis Produced when UV light is present Vitamin D allows your body to absorb calcium

20. Skin Structure

21. 2 Layers Epidermis Dermis

22. Epidermis Outermost Layer Made of dead skin cells New cells are constantly being made to replace the ones that are rubbed off Contains Melanin

23. Epidermis Outermost Layer Made of dead skin cells New cells are constantly being made to replace the ones that are rubbed off Contains Melanin

24. Melanin Pigment that gives your skin color Melanin increases in the presence of UV radiation Protects against UV damage

25. Dermis “True Skin” Layer below the epidermis Thicker than the epidermis Made of living cells Contains - blood vessels - nerves - sebaceous (oil) glands - sweat glands - hair follicles

27. Fatty Tissue Layer Below the dermis Insulates the body “Hypodermis”