chapter 11 properties of the hair and scalp

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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

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