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70 terms

chapter 11 properties of the hair and scalp

STUDY
PLAY
trichology
the scientific study of hair, its diseases, and care is called
hair shaft and hair root
the two parts of a mature strand of human hair are the
follicle
the tube-like depression or pocket in the skin or scalp that contains the hair root is the
soles of the feet
hair follicles are not found on the
arrector pili
the _______ is a tiny, involuntary muscle in the base of the hair follicle
sebum
an oily substance secreted from the sebaceous glands is
an alkaline ph
for chemicals to penetrate a health cuticle hair layer, they must have
round
the medulla is composed of ________ cells
keratinization
the process whereby living cells mature and begin their journey up the hair shaft is
nitrogen and sulfur
the five main elements that make up the chemical compostition of human hair are carbon, oxygen,hydrogen, and
peptide bonds
the chemical bonds that hold together the amino acid molecules are called
pheomelanin
which type of melanin provides natural colors ranging from red and ginger to yello and blond
extremely straight hair
asians tend to have
a detangling rinse
to help minimize tangles in extremely curly hair when washing, you should use
coarse, medium, or fine
hair texture is classified as
hair density
the measurement of individual hair strands on 1 square inch (2.5 square centimeters) of the scalp is
more alkaline solutions
compared to hair with high porosity, chemical services performed on hair with low porosity require
50 percent
wet hair with normal elasticity will stretch up to _______ of its original length
with normalizing shampoo
oily scalp and hair can be treated by properly washing it
vellus
which type of hair almost never has a medulla
anagen
the growth stage during which new hair is produced is
1 inch (2.5cm) per month
the average growth of healthy scalp hair is
canities
the technical term used to describe gray hair is
hypertrichosis
a condition of abnormal hair growth on areas of the body is
pityriasis
the medical term for dandruff is
amino acids
the body can produce 11 of the 20 ________ that make up hair
one-third
salt bonds account for about ________ of the hairs overal strength
years
the anagen phase generally lasts from three to five
faster
scalp hair grows _______ on women than on men
catagen
the _______ phase signals the end of the growth phase
increases
scalp massage _______ hair growth
neither coarser nor more resistant
compared to pigmented hair, gray hair is
can be almost any shape
cross-sections of hair
less successful
bald men are commonly perceived as
40
by age 35, almost _________ percent of both men and women show some degree of hair loss
men only
finasteride is an oral prescription medication for hair loss that is meant for
at or before birth
congenital canities manifests
dry scalp
dandruff can easily be mistaken for
fungus
dandruff is believed to be caused by a
tinea barbae
the most frequently encountered fungal infection resulting from hair services is
itching
tinea is characterized by
pediculosis capitis
the infestation of the hair and scalp with head lice is called
larger
a carbuncle is similar to a fruncle, but is
more fragile
fine hair is _______ than coarse or medium hair
is stronger than fine hair
coarse hair
cuticle
the _____ is the outermost layer of the hair
sebaceous
the oil glands in the skin that connected to the hair follicles are the _____ glands
hydrogen
a _____ bond is a physical bond easily broken by water or heat
90
hair is approximately _______ percent protein
alopecia totalis
total scalp hair loss is known as
hirsuties
hypertrichosis is also known as
malassezia
the naturally occuring fungus that causes the symptoms of dandruff when it grows out of control is
hair bulb
the ______ is the lowest part of a hair strand
monilethrix
the technical term for beaded hair is
scabies
a highly contagious skin disease caused by a parasite called a mite that burrows under the skin is
helix
the term for the spiral shape of a coiled protein is
has no effect on hair growth
shaving,clipping, and cutting the hair on the head
scutula
dry,sulfur-yellow, cup-like crusts on the scalp are called
hair,skin, nails and glands
the ______ are part of the integumentary system
terminal hair
the long, coarse,pigmented hair found on the scalp,legs,arms,and bodiesof males and females is called
trichorrhexis nodosa
the technical term for knotted hair is
medulla
the ______ is the innermost layer of the hair
whorl
hair that forms in a circular patteren on the crown of the head is called
hair root
the part of the hair located below the surface of the epidermis is the
cowlick
a tuft of hair that stands stright up is a
hair porosity
the ability of the hair to absorb moisture is called
cortex
the middle layer of the hair is the
androgen alopecia
an autoimmune disorder that causes affected hair follicles to be mistakenly attacked by a persons own immune system is
lanugo hair
vellus hair is also known as
tinea
the medical term for ringworm is