| A | B |
|---|
| epidermis | top layer of skin; composed of keratinized, stratified squamous epithelium |
| dermis | second layer of skin; contains connective tissues, blood vessels and nerves |
| subcutaneous | also called hypodermis; third layer of skin; contains adipose tissue |
| melanocyte | cell in the basal layer that produces melanin |
| collagen | protein fiber that gives the skin strength |
| hair follicle | an extension of the epidermis into the dermis that contains the hair root |
| sebaceous gland | oil-secreting gland in the dermis |
| sebum | oily substance secreated by sebaceous glands; helps keep the skin moisturized |
| arrector pili | involuntary muscles attached to the hair follicles |
| cuticle | skin around the fingernail |
| lunula | whitish, half-moon shape at the base of the nail |
| keratin | fiberous protein found in the epidermis, hair and nails |
| first degree burn | superficial burn causing damage to the epidermis alone |
| second degree burn | partial-thickness burn causing damage to the epidermis and the dermis |
| third degree burn | serious burn affecting all three layers of the skin |
| melanoma | skin cancer which arises from melanocytes |
| carcinoma | any cancer which arises from epithelial cells |
| melanin | a blackish or brown pigment produced by melanocytes |
| sweat glands | glands located in the dermis which secrete sweat |
| stratum basale | the first and lowest epithelial layer of the epidermis; contains the stem cells which produce new skin cells by mitosis |
| stratum corneum | the outermost layers of the epidermis; composed of dead, keratinized cells |
| keratinization | the process of a cell being filled with the keratin protein; results in a tough, dead cell |
