2. INTEGUMENTARY SYSTEM skin

3. Components of the integumentary system Skin Hair Nails Glands

4. Skin is the human body’s largest organ

5. The #1 function of skin PROTECTION

6. How Skin Protects the Body Barrier against infection and injury Help regulate body temperature Remove waste products Provide protection against UV radiation from the sun Produce Vitamin D

7. Skin also transmits sensations like… Pressure Heat Cold Pain

8. Cool facts about skin Waterproof Self-repairing Keeps germs and water OUT Keeps body fluids (like blood) and salts IN Sweat is a way to get rid of unneeded chemicals Skin is alive and renews the top layer about once a month

9. Layers of the skin Top layer Epidermis Middle layer Dermis Bottom layer Subcutaneous layer

10. What is in the Epidermis? Epithelial Tissue Outer layer of dead cells Melanocytes Produce melanin – a dark brown pigment (color) Pores

11. What is in the Dermis? Living cells Blood vessels Hair follicles Nerve endings Muscles Glands

12. The Two Main Glands in Skin Sweat glands Release sweat to cool body Sebaceous (oil) glands Keeps skin soft Waterproof skin Protect against germs

13. Muscles in Skin??? The tiny muscles attached to hair follicles cause “goose bumps” when they contract and pull the hair upright

14. What is in the Subcutaneous Layer??? Fat Connective tissue Blood vessels

15. The job of the subcutaneous layer To cushion the body’s internal organs from blows and bumps