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Properties of the Hair and Scalp

STUDY
PLAY
The scientific study of hair, its diseases, and care it called
trichology
the two parts of a mature strand of human hair are the
hair shaft and hair root
the tube-like depression or pocket in the skin or scalp that contains the hair root is the
follicle
hair follicles are not found on the
soles of the feet
the ___ is a tiny, involuntary muscles in the base of the hair follicle
arrector pili
an oily substance secreted from the sebaceous glands is
sebum
for chemicals to penetrate a healthy cuticle hair layer, they must have
an alkaline ph
the medulla is composed of ____ cells
round
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 carbon, oxygen, hydrogen, and
nitroge and sulfue
the chemical bonds that hold together the amino acid molecules are called
peptide bonds
which type of melanin provides natural colors ranging from red and ginger to yellow and blond tones
pheomelanin
asians tend to have
extremely striaght hair
to help minimize tangles in extremely curly hair when washing you shoud use
detangling rinse
hair texture is classified as
coarse, medium, or fine
the measurement of individual hair strands on 1 square inch (2.5 square centimeters) of the scalp is
hair density
compared to hair with high porosity, chemical services performed on the hair with low porosity require
more alkaline solutions
wet hair with normal elasticity will stretch up to ____ of its original length
50%
oily scalp and hair can be treated by properly washing it
with normalizing shampoo
which type of hair almost never has a medulla?
vellus
the growth phase during with new hair is produced is
anagen
the average growth of healthy scalp is
1 inch
the technical term used to describe gray hair is
canities
a condition of abnormal hair growth on area of the body is
hypertrichosis
the medical term for dandruff is
pityriasis
the body can produce 11 of the 20 ___ that make up the hair
amino acids
salt bonds account for about ___ of the hair's overall strength
one-third
the anagen phase generally lasts from 3 to 5
years
scalp hair grows____ on women than on men
faster
the _____ phase signals the end of the growth phase
catagen
scalp massage____ hair growth
does not affect
compared to pigmented hair, gray hair is
neither coarser nor more resistant
cross-sections of hair
can be almost any shape
bald men are commonly perceived as
less successful
by age 35, almost____% of both men and women show some degree of hair loss
40
finasteride is an oral prescription medication for hair loss that is meant for
men only
congenital canities manifests
at or before birth
dandruff can easily be mistaken for
dry scalp
dandruff is believed to be caused by a
fungus
the most frepuently encountered fungal infection resulting from hair services is
tinea barbae
tinea is characterized by
itching
the infestation of the hair and scalp with head and lice is called
pediculosis capitis
a carbuncle is similar to a furuncle but is
larger
fine hair is ____ than coarse of medium hair
more fragile
coarse hair
is stronger than fine hair
the ____ is the outermost layer of haie
hair cuticle
the oil glands in the skin that are connected to the hair follicles are the ____ glands
sebaceous
a ____ bond is a physical bond easily broken by water or heat.
hydrogen
hair is approximately ____ % protein
90
total scalp hair loss is known as
alopecia totalise
hypertrichosis is also known as
hirsuties
the naturally occuring fungus that causes the symptoms of dandruff when it grows out of control is
malassezia
the ___ is the lowest part of the hair strand
hair bulb
the technical term for beaded hair is
monilethrix
a highly contagious skin disease caused by a parasite called a mite that burrows under the skin is
scabies
the term for the spirsl shape of a coiled protein is
helix
shaving, clipping, and cutting the hair on the head
has no effect on hair growth
dry, sulfur-yellow, cup-like crusts on the scalp are called
scutula
the ___ are part of the integumentary system
hair, skin, nails, glands
the long, coarse, pigment hair found on the scalp, legs, arms, and bodies of males and females is called
terminal hair
the technial term for knotted hair is
trichorrhexis nodosa
the ___ is the innermost layer of the hair
medulla
hair that forms in a circular pattern on the crown of the head is called
whorl
the part of the hair located below the surface of the epidermis is called
hair root
a tuft of hair that stands striaght up is a
cowlick
the ability of the hair to absorb moisture is called
hair porosity
the middle layer of the hair is the
cortex
an autoimmune disorder that causes affected hair follicles to be mistakenly attacked by a person's own immune system is
alopecia areata
vellus hair is also known as
lanugo hair
the medical term for ringworm is
tinea