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77 terms

Chapter 9: Properties of the Hair and Scalp

STUDY
PLAY
trichology
the scientific study of the hair, it's deseases, and its care is
hair shaft
the two main divisions of the hair root and the
dermal papilla
the three main structures associated with the hair root are the follicle, bulb, and the
follicle
the hair root is contained in a tube-like depression, or pocket, in the skin
hair bulb
club-shaped structure that forms the lower part of the hair root
dermal papilla
the blood and nerve supply that provides nutrients needed for hair growth are contained in the
arrector pili
goose bumps, involutntary muscles
sebaceous glands
the oily substance called sebum is secreted by
medulla
the three layers of hair shaft are the cuticle, cortex, and
cuticle
layer of the hair shaft that protects it from penetration and damage
medulla
generally, only thick coarse hair contains
cortex
90% of total wieght of hair
cuticle
liquids can penetrate the hair only when the ___ is raised.
alkaline ph
in order to penetrate the cuticle layer and reach the cortex, oxidation haircolors, perm solutions, and chemical relaxers must have
cortex
the changes that take place in the hair during permanent waving, chemical relaxing, and oxidation hair coloring occur in the
keratin
as living cells in the hair mature, the y fill up with protien called
oxygen and sulfer
the elements that make up the amino acids in the hair are carbon, nitrogen, hydrogen
carbon
of the five elements in the human hair, the element that makes up the highest percentage is
peptide bonds
the chemical bonds that join amino acids to each other are called
side bonds
the bonds that account for the strength and elasticity of the hair
hydrogen, salt, and disulfide bonds
there are three different types of side bonds in the cortex
disulfide bonds
strongest side bonds in the cortex
sulfer
a disulfide bond joins the ___ atoms of two neighboring cyctine amino acids to create cystine
perms and relaxers
disulfide bonds can be broken down by
water of heat
a hydrogen bond is a physical side bond that is easily broken by
eumelanin and pheomelanin
all natural hair color is based on the ratio of
pheomelanin
the pigment that provides natural hair colors from red and ginger to yellow/blonde is
cortex
all natural hair color is the result of the pigment located within the
wave pattern
the amount of movement in the hair strand is
oval
a cross-section of a wavy hair strand is
has a fine texture
extremely curly hair that forms coils usually
length
the four most important factors to consider in a hair analysis include all the following except
diameter
hair texture is defined as the hair's
porosity
the hair's ability to absorb moisture is it's
coarse
____ hair has the largest diameter
fine
the hair texture that has the most suseptible to damage from chemical services is
density
the number of individual hair strands on one square inch
color of the hair
the number of hairs on the head generally varies with the
blonde hair
highest density, thickest hair is found among
resistant
hair with lowest porosity is considered
overprocessed
hair with high porosity
50%
wet hair with normal elasticity will stretch up to ___ of its original length and return to the same length without breaking
hair stream
hair flowing in the same direction
inactive sebacceuos glands
dry hair and scalp are caused by
more abundant on men
all the following characteristics apply to the vellus hair except
terminal hair
hormonal changes during puberty cause some areas of vellus hair to be replaced with
telogen
the three phases of hair growth are anagen, catagen, and
anagen
the growth phase of the hair growth cycle is known as
catagen phase
the follicle canal shrinks and detaches from the dermal papulla during the
90%
about ___ of the scalp hair is growing in the anagen phase at any one time.
catagen phase
the phase of the hair growth that lasts the shortest time is the
telogen
the resting phase of the hair growth cycle is known as
10%
about ___ of the hair is in the resting phase at any one time.
scalp massage increases hair growth
one common hair myth is
lacks melanin
gray hair is exactly the same as pigmented hair except that it
normal
a loss of 35 to 40 hairs a day is considered
alopecia
abnormal hair loss is called
analyzed
a clients hair must be ____ before any service.
40
by the age of 35, almost ____ percent of men and women show some degree of hair loss.
alopecia areata
a type of alopecia by the sudden falling out of hair in round patches or baldness in spos is called
minoxidal
a topical medication applied to the scalp that has been proven to stimulate hair growth is
canities
gray hair, technical term
canities
ringed hair is a variety of
monilethrix
technical term, beaded hair
trichoptilosis
technical term, split ends
hypertrichosis
abnormal hair growth
trichorrhexis nodosa
brittleness and nodular swelling along the hair shaft
pityriasis capitis simplex
dry dandruff, thin scales, and an itchy scalp
referred to physician
clients with tinea capitis should be
vegetable parasites
tinea or ringworm is caused by
tinea capitis
ringworm of the scalp
tinea favosa
scutula
scabies
itch mites that burrow under the skin
head lice
pediculosis capitis is the infestation of the hair and scalp
furuncle
a boil
a carbuncle
an inflammtion of the subcutaneous tissue caused by staphylococci
sanitation and disinfection
preventing spread of tinea, pityriasis, and staphylococci infections involves proper