Hair Structure
The outermost layer of the of the hair.
Cuticle
The hair shaft is a nonliving fiber composed of
Keratinized protein
What are the three stages of hair growth?
Anagen, Catagen, & Telogen
An autoimmune disorder that causes the affected hair follicles to be mistakenly attacked by a person's own immune system.
Alopecia Areata
What is a characteristic of scabies?
Excessive itching
This layer of the hair may be absent in very fine and naturally blond hair.
Medulla
How many side bonds are found in the cortex of the hair?
3; Hydrogen, Salt, & Disulfide
During what cycle of hair growth is new hair grown?
Anagen
What type of alopecia is male pattern baldness, which usually progresses to the familiar horseshoe-shaped fringe.
Androgenic Alopecia
What is characterized by scalp irritation and large flakes?
Classic Dandruff
A healthy, compact cuticle layers is responsible for what in the hair?
Shine and Silkiness
The side bond that is weak, great in numbers, and broken by water or heat.
Hydrogen Bonds
What is the average growth rate of healthy hair on the scalp per month?
1/2 inch
A condition that results in the abnormal growth of hair.
Hypertrichosis
Th result of an acute, deep-seated bacterial infection in the subcutaneous tissue is known as a?
Carbuncle
The protein structure that provides strength, elasticity, and natural color to the hair is found in what part of the hair structure?
Cortex
A weak, physical side bond, which crosslinks polypeptide chains, but it reacts to changes in pH.
Salt Bonds
In what hair growth phase does the follicle shrink, the hair bulb disappear, and the root end form a rounded club?
Catagen
Monilethrix is the technical term for?
Beaded Hair
Barber's itch is applied most frequently to which condition?
Folliculitis Barbae
The spiral shape of a coiled protein is called?
A helix coil
Bonds that are broken by chemical relaxers and cannot be rebuilt.
Disulfide Bonds
What has been scientifically been proven to increase hair growth?
Finasteride. (A medication primarily used to treat conditions related to hormonal imbalances affecting hair and prostate health.)
Tinea is a medical term for?
Ringworm
What can be caused by improper shaving or broken hair below the skin surface that grows into the side of the follicle?
Pseudofolliculitis Barbae