1. Turn answers to this in! What are the layers of the epidermis? What causes skin color?

2. Functions of the skin Protection Body Temperature Regulation Blood reservoir Excretion Metabolic Functions Cutaneous Sensation

3. Protection Physical – Hardness of keratinocytes – Waterproofing Chemical – Acidic secretions – Bacteriacidal secretions Biological – Langerhans cells

4. Temperature How do we stay cool in the warm environments? How about staying warm in cold environments?

5. Blood reservoir Body will shunt blood away from skin if needed elsewhere

6. Excretion Get rid of salt, water, and Nitrogen

7. Metabolic Function Vitamin D Synthesis

8. Cutaneous Sensation