1. The Skin as an Organ Chapter 14

2. The Bodies Tough Covering The skin performs several major functions in the body

3. The Functions of your Skin 1. The skin covers the body and prevents water loss 2. Your skin protects the body and prevents infection

4. The Functions of your Skin 3.Your skin helps regulate body temperature 4.Your skin eliminates waste and helps gather information about the environment

5. The Functions of your Skin 5.Your skin cells produce vitamin D in the presence of sunlight. Vitamin D is important for healthy bones because it helps the cells in your digestive system absorb the calcium in your food.

6. Your Skin is made up of two major layers 1. Epidermis 2. Dermis

8. The Epidermis The Epidermis is the outermost layer of the skin The top layer consist of dead cells The bottom consist of new living cells.

9. The Epidermis Cells deep in the epidermis produce melanin Melanin is a pigment that gives skin its color

10. The Dermis The dermis is the second layer of skin and is located below the epidermis.

11. The Dermis Contains the following 1) Fat Tissue 2) Nerves 3) Hair Follicle 4) Oil Glands 5) Sweat Glands 6) Muscles BrainPOP | Health | Learn about Skin

12. Caring for your skin Four simple habits can help keep your skin healthy 1) Eat Properly 2) Drink Enough Water 3) Limit your exposure to the sun 4) Keep your skin clean and dry

13. Keeping your Skin Clean One bacterial infection of the skin that can be difficult to control is Acne http://www.brainpop.com/health/personalhealth/acne/

14. Skin Cancer Excessive exposure to the ultraviolet radiation in sunlight can produce skin cancer, an abnormal growth of cells in the skin. In addition, you should always use a sunscreen with a sun protection factor (SPF) of at least 15.

15. Hair and Nails The basic structure of human hair and nails is keratin In other animals, keratin forms a variety of structures, including bull horns, reptile scales, bird feathers, and porcupine quills.

16. Hair Hair is produced by cells at the base of structures called hair follicles. Hair follicles are tubelike pockets of epidermal cells that extend into the dermis Hair follicles are in close contact with sebaceous glands. The oily secretions of these glands help maintain the condition of each individual hair. http://www.brainpop.com/health/bodysystems/hair/

17. Nails Nails grow from an area of rapidly dividing cells known as the nail root. Nails grow at an average rate of 3 millimeters per month, with fingernails growing more rapidly than toenails—about four times as fast. BrainPOP | Health | Learn about Nails