-
the scientific study of hair, its diseases and care is called
trichology
-
the two parts of a mature hair strand are the hair shaft and
hair root
-
the portion of the hair that projects above the skin is the
hair shaft
-
the follicle bulb papilla arrector pili muscle and sebaceous glands are main structures of the
hair root
-
the tubelike depression or pocket in the skin or scalp that contains the hair root is the
follicle
-
hair follicles are not found on teh palms of the hands or the
soles of the feet
-
the follicle extends downward from the epidermis where it surrounds the
dermal papilla
-
the lowest area or part of the hair strand is the
hair bulb
-
a small cone shaped area at the base of the hair follicle that fits into the hair bulb is the
dermal papilla
-
a tiny involuntary muscle fiber inserted in the base of the hair
arrector pili
-
the oil glands of the skin connected to the hair follicles are
sebaceous glands
-
an oily substance secreted from the sebaceous glands is
sebum
-
the overlapping layer of hair with transparent scalelike cells is
cuticle
-
the three main layers of the hair shaft are the cuticle medulla and
cortex
-
swelling the hair raises the cuticle layer and allows for
penetration
-
for chemicals to penetrate a healthy cuticle hair layer, they must
have an alkaline ph
-
the fibrous protein core of the hair formed by enlongated cells containing melanin pigment, is the
cortex layer
-
the medulla is the innermost layer of the hair and is composed of
round cells
-
hair is composed of a protein that grows from cells originating within the
hair follicle
-
the process whereby living cells mature and begin their journey up the hair shaft is
keratinization
-
the five main elements that make up the chemical composition of human hair are barbon, oxygen, hydrogen, and
nitrogen and sulfer
-
the chemical bonds that hold together the amino acid molecules are
peptide bonds
-
an end bond is also known as
peptide bond
-
when peptide bonds hold together a very long chain of amino acids it is called a
polypeptide chain
-
the three types of cross links that form the bonds between the polypeptide chains are hydrogen bonds salt bonds and
disulfide bonds
-
a weak type of physical side bond that is easily broken by water or heat is a
hydrogen bond
-
a salt bond is easily broken with the use of
strong alkaline or acidic solutions
-
bonds that must be chemically separated are
disulfide bonds
-
hydrogen chemical hair relaxers break disulfide bonds and during rinsing convert then to
lanthionline bonds
-
the natural hair pigment foudn in the cortex layer of the hair is
melanin
-
the 2 different types of melanin are eumelanin and
pheomelanin
-
natural wave patters are the result of
genetics
-
asians tend to have
extremely straight hair
-
extremely curly hair grows
in long twisted spirals
-
to help minimize tangles in extremely curly hair when washing you shoudl use
detangling rinse
-
extremely curly hair may often break or knot easily due to
low elasticity
-
four important factors to consider in hair analysis are texture porosity...
elasticity and density
-
the thickness or diameter of the individual hair strand is the
texture
-
hair texture is classifiedas
coarse medium or fine
-
the measurment of individual hair strands on one square inch of the scalp is
hair density
-
the ability of the hair to absorb water or oil is
porosity
-
chemical services performed on hair with low porosity require
more alkaline solutions
-
hair with high porosity is often the result of
overprocessing
-
the ability of the hair to stretch and return without breaking is
elasticity
-
wet hair with normal elasticitywill stretch up to
50 percent
-
when shaping and styling hair considerthe hairs
natural growth patterns
-
dry hair and scalp can be caused by
inactive sebaceous glands
-
oily scalp and hair can be treated by properly shampooing with
normalizing shampoo
-
hair that is no pigmented and almost never has a medulla is
vellus
-
long, soft hair found on the scalp legs arms and bodies of males and females is
terminal
-
the phasesof hair growth are anagen catagen and
telogen
-
the growth phase where new hair is produced is
anagen
-
the average growth of healthy scalp hair is
one inch a month
-
the final resting phase in the hair growth cycle is
telogen stage
-
in general the cross sections of curly hair can be
oval
-
the term used to identify abnormal hair loss is
alopecia
-
the sudden falling out of hair in round patches or baldness in spots is called
alopecica areata
-
2 products approved by the fda to stimulate hair growth and allowed for sale in the us are
minoxidil and finasteride
-
the technical term used to describe gray hair is
canities
-
a variety of canities characterized by alternating bands of gray and pigmented hair is
ringed hair
-
a condition of abnormal hair growth on areas of the body is
hypertrichosis
-
trichorrhexis nodosa is characterized by brittleness of the hair and formation of
swellings along the hair shaft
-
the technical term used to describe beaded hair is
monilethrix
-
the medical term for dandruff is
pityriasis
-
the medical term used to describe a fungal organism charactorized by itching scales and painful circular lesions is
tinea
-
the type of fungal infection characterized by red papules at the opening of the hair follicle is
tinea capitis
-
a highly contagious skin disease caused by a mite parasite is
scabies
-
an acute localized bacterial infection of the hair follicle that produces constant pain is
furuncle
-
an inflammation of the subcutaneous tissue caused by staphylococci is
carbuncle
-
the spread of diseases can be prevented by practicing approved
sanitation and disinfection procedures
|
|