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Name one reason cosmetologists must understand hair and scalp properties
Identifying hair growth cycles and knowledge of hair loss
Delay of the hair shaft responsible f.... the strength elasticity and color is
cortex
when it causes intelligence slides their thumb and forefinger from the end of the hair strand towards the scalp what are they analyzing
hair texture
What percentage of protein is hair approximately made up of
90
What is a long chain of amino acids linked by peptide bonds
Polypeptide chain
What is the portion of the hair living underneath the skin Is a muscle
arrector pili muscle
The COHNS elements
Carbon oxygen hydrogen nitrogen and sulfur
Diameter of individual hair string is defined as what
Texture
Name the three types of side bonds
Hydrogen salt and disulfide
The measurement of iindividual hair strands on one square inch is
Density
What are the three layers of the hair shaft consist of
The cortex the hair cuticle and the medulla
What bond is formed when sulfur atoms, amino acids, with polypeptide chains joined together
Disulfide bonds
Dry hair and scalp can be caused by
Inactive sebaceous glands
The phase of hair grows cycle where hair can shed
Telogen phase
The phase of the hair growth where the hair sheds
telogen phase
The part of the hair root structure that supplies the nutrients for hair growth
dermal papilla
A cosmetologist should have the hair cool before styling when what bonds have been broken by heat from a tool like a curl and iron
Hydrogen bonds
To determine how quickly here will process during a chemical service a cosmetologist should feel The hair strand to determine what
texture
During what phase does the follicle canal shrink and detach which is a short transition phase
Catagen phase
The ability of the hair to absorb moisture is known as
porosity
This is considered the hairs pith or core
Medulla
What is the outermost layer of the hair
Cuticle
Three types of body hair
Terminal hair Lanugo hair vellus hair
If your client cannot grow hair beyond the shoulder length what phase is the cause
anagen phase
What kind of hair has the largest diameter and usually requires more processing
coarse hair