What is Human Hair?
The study of hair, including its diseases and care
What is Trichology
The hair shaft consists of what 3 parts?
What is the cuticle, cortex and medulla.
The three types of side bonds
What are hydrogen, salt, and disulfide.
The diameter of an individual hair strand and is classified as fine, medium, or coarse.
What is hair texture.
Hair grows in a circular pattern
What is a whorl
A strand of human hair has two parts.
What is the hair root and hair shaft.
The outermost layer of the hair and is formed from cells that overlap
What is the Cuticle
These are a weak physical side bond and are easily broken by water or heat
What is hydrogen bonds
This measures the number of individual hair strands on 1 square inch and can be considered low, medium, or high but also known as thin, medium, or thick.
What is hair density.
The three main types of body hair are
What are lanugo, vellus, and terminal.
This is a tube-like structure in the skin that surrounds the hair root and anchors the hair in the skin.
What is the hair follicle
The fibrous protein layer of the hair and is responsible for hair’s strength, elasticity, and color
What is the cortex
These bonds are broken by changes in pH
What is salt bonds
This refers to hair’s ability to absorb moisture and is determined by the cuticle layer’s condition and the degree the “scales” of the cuticle are raised.
What is hair porosity
Hair growth cycle features three phases
What are anagen, catagen, and telogen.
The Hair’s living portion is found below the skin consists of the:
What is the hair follicle, hair bulb, and dermal papilla.
This is also known as the hair’s pith or core.
What is the medulla
These bonds are strong chemical bonds that are broken by Thio perms or relaxers as well as Hydroxide relaxers.
What are disulfide bonds.
This is the hair’s ability to stretch and return to its original length without breaking which is a reflection of the strength of the side bonds in the cortex.
What is hair elasticity
What phase causes the follicle canal to shrink and detaches from the dermal papilla.
What is the catagen phase
This is the skin’s outer layer
What is the epidermis
The major elements that make up human hair
What are carbon, oxygen, hydrogen, nitrogen, and sulfur.
Hydroxide chemical hair relaxers break disulfide bonds and convert them into new bonds.
What are lanthionine bonds.
Although not a consideration during a hair analysis, natural hair color is the result of a pigment called
What is melanin
This is the final stage of the hair growth cycle and lasts how long?
What is telogen and 3-6 months.