Question | Answer |
What is Trichology? | The study of hair and it's diseases and care |
What are 2 main parts that full grown human hair is divided into? | Hair Root & Hair Shaft |
Arrector Pili | A tiny, involuntary muscle in the base of the hair follicle. Responsible for goosebumps. |
A small, cone-shaped elevation located at the bottom of the hair follicle. | Dermal Papilla |
A tube-like depression/pocket in the skin/scalp containing hair root. | Follicle |
Lowest area or part of hair strand. Club-shaped structure that forms in the lower part of the hair root. | Hair Bulb |
Oil glands are also known as ____________ ____________ and are connected to hair follicles. | Sebaceous Glands |
The cells that make up hair are divided into 3 layers: | Cuticle- Outtermost
Cortex- Middle Layer- contains melanin
Medulla- Innermost layer |
What are the 3 phases that all hair follicles cycle through? | Anagen- Growth Phase
Catagen- Brief Transistion Period
Telogen- Resting Phase |
Hair that forms in a circular patter, as on the crown | Whorl |
Ability of hair to absorb moisture | Porosity |
Elasticity | Ability of the hair to stretch and return to its original length without breaking |
Texture | Refers to the degree of coarseness or fineness of the hair |
The sudden loss of hair in round or irregular patches without inflammation is called what? | Alopecia Areata |
What is Trichorrehexis Nodosa | "Knotted Hair" |
Element in Normal Hair:
a)Nitrogen
b)Hydrogen
c)Oxygen
d)Carbon | a)17%
b)6%
c)21%
d)51% |
A side bond that is easily broken by strong alkaline or acidic solutions is called a ____________ bond | disulfide |
Amount of movement in hair strand. Referred to as straight, wavy, curly or extra curly | Wave Pattern |
Vellus Hair | short, fine, unpigmented, downy hair on the body |
Technical term for gray hair | canities |
Technical term for split ends | Trichoptlosis |
"Beaded Hair" is known as | Monilethrix |
Fungal infection of scalp- Red papules or spots at opening of hair follicles | Tinea Capitis |
Technical term for Lice | Pediculosis Capitis |
What is the part of the hair located below the surface of the scalp called? | Hair root |
What is the portion of the hair that projects above the skin called? | Hair Shaft |
What are the six main structures of the hair? | Hair follicle, Arrector Pili, Sebaceous gland, Dermal Papilla, Hair bulb and Hair root |
Layer of the hair that consists of transparent scale like cells that resemble the shingles on a roof | Cuticle |
What layer of hair only exists in coarser hair textures? | Medulla |
What are proteins made of? | Amino Acids |
What type of bonds link amino acids together? | Peptide bonds |
What are three types of side bonds? | Salt, Hydrogen and Disulfide |
What type of melanin provides black and brown color to the hair? | Eumelanin |
What type of melanin provides red and ginger to yellow and blonde tones to the hair? | Pheomelanin |
What side bond is weakest? | Hydrogen |
What side bond is strongest? | Disulfide |