Properties of the Hair and Scalp

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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

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