Hair Structure
The scientific study of hair and it's diseases
Cosmetology or trichology
Trichology
The greek word trichos means what
hair
Hair is made up of _______% or protein
90%
tiny grains of pigment in the cortex that give natural color to the hair
melanin
canities is the technical term for_______hair
gray hair
How many MAIN layers of the hair shaft are there?
3-cuticle,cortex, medulla
The hair, skin, and glands are part of the________system.
integumentary or endocrine
integumentary
a fibrous protein is called
keratin
provides natural dark brown to black to the hair and is the dark pigment dominant
eumelanin or pheomelanin
eumelanin
The growth phase during which new hair is produced?
anagen or telogen
anagen
The outermost layer of the hair
cuticle
What part of the hair is located below the surface of the epidermis?
hair root or hair shaft
hair root
Major elements that make up human hair are carbon, oxygen, hydrogen, nitrogen, and sulfur. They are referred to as_______
COHNS elements or keratinization
COHNS elements
lighter pigment that provides natural colors ranging from red and ginger to yellow and blond tones
eumelanin or pheomelanin
pheomelanin
What is the resting phase/final phase of the hair cycle?
anagen or telogen
telogen
The MIDDLE layer of the hair. This layer has a fibrous protein core that contains melanin pigment
CORTEX
The pocket or tube like depression in the scalp that contains the hair root is_________
the hair follicle or hair bulb
hair follicle
The three different types of side bonds that link chains of amino acids together are__________
oxygen, hydrogenn, salt OR
hydrogen, salt, disulfide
hydrogen, salt, disulfide
what refers to the shape of the hair strand
hair stream or wave pattern
wave pattern
Falling out of hair in round patches or baldness in spots is known as.....alopecia totalis or alopecia areata
alopecia areata
innermost layer-this layer is not involved in salon services
medulla
What is the oily substance secreted by the skin's oil glands that lubricate the hair and skin?
keratin or sebum
sebum
Hydroxide chemical relaxers break disulfide bonds and convert them to ________bonds
lanthionine or sulfur
lanthionine
What is the cross-section shape of curly hair?
oval or round
Oval
What is a highly contagious skin disease caused by a parasite called a mite?
scabies or dandruff
scabies