OREGON STATE BOARDS COSMETOLOGY HAIR DESIGN QUESTIONS AND ANSWERS, GRADED A+/| latest update 2024/25|

OREGON STATE BOARDS COSMETOLOGY HAIR DESIGN QUESTIONS AND ANSWERS, GRADED A+/ Trichology - -Technical name for the study of hair The main purposes of hair are - -Adornment and protection from heat, cold and injury Only the cells of the ___are alive. - -Hair Bulb. The hair fiber or strand itself are not alive. Hair Root - -the portion of hair that is inside the hair follicle UNDER the skin's surface Hair Fiber - -Portion of the hair that extends above the skins surface Papilla - -is filled with capillaries that supply nourishment to the cells around it, called germinal matrix cells. Germinal matrix - -The area of the bulb where cell division (mitosis) takes place Cuticle - -The outer covering of the hair shaft made up of overlapping layers of transparent scales Cortex - -the second layer consisting of unique protein structures (gives hair most of its pigment and strength *elasticity*) Medulla - -the central core of the hair shaft, also called the pith or marrow (often absent in fine or very fine hair) Sebum mixes with the body's perspiration to form the: - -Acid Mantle The Acid Mantle is important because: - -it protects the cuticle, or outer covering, of the hair fiber and maintains the acid balance of hair and skin. Hair pulled out from the roots will grow again unless: - -The papilla (origin of hair) is destroyed Keratinization - -is a process whereby cells change their shape, dry out and form keratin protein. Once keratinized, the cells that form the hair fiber or strand are: - -no longer alive. Hair is made up primarily of: - -protein Anagen - -Active growing stage of hair Catagen - -Brief transitional stage of hair growth when all cell division stops. Telogen - -Resting phase of hair growth In humans, the average rate of hair growth is: - -1/2" (1.25cm) per month Supercilia - -technical name for the hair of the eyebrow