amino acids - units joined together by peptide bonds to form polypeptide chains that comprise proteins, arrector pili muscle - small, involuntary muscle in the base of the hair follicle, COHNS elements - five elements that make up human hair, skin, tissue, and nails, cortex - middle layer of the hair; fibrous protein core formed by elongated cells containing melanin pigment, cysteine - amino acid with sulfur atom that joins together two peptide strands, dermal papilla - small, cone-shaped elevation located at the base of the hair follicle that fits into the hair bulb, hair bulb - lowest part of hair; thickened, club-shaped structure forming the lower part of the hair root, hair cuticle - outermost layer of hair; single, overlapping layer of transparent, scale-like cells , hair follicle - tube-like depression or pocket in the skin or scalp that contains the hair root, hair root - part of the hair located below the surface of the epidermis, hair shaft - portion of the hair that projects above the epidermis, keratin - fibrous protein that grows from cells originating within the hair follicle, keratinization - process by which newly formed cells in the hair bulb mature, fill with keratin, move upward, lose their nucleus, and die, medulla - innermost layer of the hair that is composed of round cells; often absent in fine and naturally blond hair, sebaceous glands - oil glands in the skin that are connected to the hair follicles, sebum - fatty or oily substance secreted by the sebaceous glands; lubricates the skin, trichology - scientific study of hair and its diseases and care,

Cosmetology Chapter 11 - Vocab 1

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