1. 36.3 The Integumentary System

2. Epidermis Layers of cells that completely encloses vascular tissue.

3. Keratin Tough, fibrous protein found in skin.

4. Melanin Dark- brown pigment found in skin.

5. Dermis Inner layer of the skin.

6. Hair Follicle Tube like pocket of epidermal cells that extends into the dermis; cells at the base of hair follicles produce hair.

7. Key Concept The integumentary system serves as a barrier against infection and injury, helps to regulate body temperature, removes waste products from the body, and provides protection against ultraviolet radiation from the sun.