| A | B |
|---|
| integumentary system | consists of skin, hair, nails |
| epidermis | outer layer of skin/dead cells |
| melanin | a pigment that protects hair and skin against ultraviolet radiation |
| dermis | consists of blood vessels, hair follicles, sebaceous glands, sweat glands and nerves |
| keratin | a protein found in the dermis; tough and waterproof |
| vitamin D | made in the skin when it is exposed to sunlight |
| sebaceous gland | oil glands |
| sweat glands | located in the dermis; cool the body |
| sensory receptors | includes touch, heat, pain, cold and pressure |
| blood vessels | when you get hot-the ones in the skin dilate and allow more blood circulation and heat transfer |
| functions of the skin | prevents water loss, prevents entry of microorganisms,regulates body temperature and removes waste products |
