| A | B |
|---|
| hair follicle | pocket that holds hair |
| hair bulb | cone shaped; protects the papilla |
| hair papilla | where hair growth begins and nourishment takes place |
| arrector pili | muscle that causes goose bumps |
| sebaceous gland | produces oil or sebum |
| hair root | part of the hair that lies underneath the skin |
| hair shaft | part of the hair above the skin |
| trichology | study of hair |
| integumentary system | includes hair, skin, nails |
| hair cuticle | protects the hair, outer layer, clear |
| hair cortex | middle layer; location of bonds and melanin |
| hair medulla | missing from blonde hair; in the center of the hair shaft |
| hair porosity | ability to absorb moisture |
| hair elasticity | ability to stretch and return |
| hair density | thick or thin; number of hair per square inch |
| hair texture | feel of hair; based on shaft diameter |
| euemelanin | black or brown color |
| phemelanin | red or yellow (blonde) |
| CHNSO | elements in hair |
| melanin | color pigments |
| keratin | protein |
| H bonds | hydrogen bonds |
| salt bonds | salt bonds |
| DORS | disulfide or sulfur bonds |
| end bonds | chemical bonds |
| cross-bonds | chemical bonds |
| peptide bond | end bond |
| disulfide bond | only broken by chemicals |
