Chapter 11

Blonds have approximately _____ hairs on the head

140,000

The chemical composition of average hair is _____% carbon

51%

At any given time, about _____% of scalp hair is growing in the anagen phase

90%

Protein makes up _____% of hair

91%

Oxidation tints and other chemical hair products must have a pH _____.

Above 7.0

Finasteride is _____.

An oral medication for hair loss

Alopecia is the technical term for

Any abnormal hair loss

Hydrogen bonds add _____ to the hair and keep parallel polypeptide chains together

Body

is caused by loss of natural melanin.

Canities

During the _____ phase, the hair bulb disappears

Catagen

____ on the scalp are symptoms of tinea favosa.

Dry, sulphur-yellow, cuplike crusts

When _____ bonds are broken through overstretching or the use of strong acidic or alkaline solutions, the hair can be weakened or damaged to the point of breakage

Even a few

Brittle hair is technically known as _____.

Fragilitas crinium

_____ that stick to the scalp in patches are characteristics of pityriasis steatoides

Greasy or waxy scales

The part of the hair that extends above the skin surface is the _

Hair shaft

Hair's natural tendency to flow to one side is called the

Hair stream

The elements in human _____ are sulfur, carbon, oxygen, hydrogen, and nitrogen

Hair,nails, and skin

_____ side bonds are easily broken by water or heat

Hydrogen

_____ is abnormal hair growth and can be treated in the barbershop

Hypertrichosis

The arrector pili is a minute, _____ in the skin attached to the underside and base of the hair follicle

Involuntary muscle fiber

Which of the following statements relating to visible hair is not correct?

It is made up of a keratinized carbohydrate

The hair bulb is the

Lower part of the hair root

_____ is a topical treatment that is applied to the scalp twice a day

Minoxidil

Hair that is missing the medulla is _____.

Naturally blonde

Wet hair with _____ elasticity can stretch up to 50% of its original length and return to that length without breaking.

Normal

The dermal papilla supplies _____ to the tissue that lines the hair follicle

Oxygen and nutrients

The strongest chemical bonds in the cortex are _____ bonds

Peptide

Dandruff is technically known as

Pityriasis

The hair's _____ is its ability to absorb moisture

Porosity

Swelling the hair raises the _____ of the cuticle layer and opens the spaces between them, allowing liquids to penetrate

Scales

Hair _____mature in a process called keratinization.

Shafts

During the _____ phase, the hair is shed

Telogen

The dermal papilla is surrounded by the

The Hair bulb

_____ is a fungal infection that occurs chiefly over the bearded area.

Tinea sycosis

Split ends are called _____.

Trichoptilosis

____ is hair loss that occurs as a result of genetics, age, and hormonal changes that cause the miniaturization of terminal hair, converting it to vellus hair.

androgenic alopecia

Alopecia is characterized by hair falling out in round patches.

areata

Secondary terminal hair appears on the ____.

beard and scalp

Hair with a _____ texture has the largest diameter

coarse

In the _ , polypeptide chains are linked to each other by side bonds.

cortex

The _____ accounts for about 90% of the hair's weight

cortex

A tuft of hair standing straight up is known as a ____.

cowlick

The atoms of neighboring _____ amino acids that are joined together by disulfide bonds are atoms of sulfur

cysteine

Amino acids are joined _____ by peptide bonds

end to end

Black and brown hair colors are provided by

eumelanin

Sycosis vulgaris, ____, and pseudofolliculitis barbae are staphylococcal infections involving the follicles.

folliculitis

Trichology is the scientific study of _____, including its care and disorders

hair

The portion of the hair that is enclosed within the follicle is the

hair root

Healthy hair on the scalp grows about 1/2 _____.

inch per month

Fine hair

is most likely to be damaged by chemical services

Scalp irritation, _____, and an itchy scalp are characteristics of pityriasis capitis simplex

large dry flakes

Resistant hair has _____ porosity

low

Androgenic alopecia in men is also called

male pattern baldness

Hair texture is measured by the diameter of the hair strand and is classified as coarse, _____, or fine

medium

Natural hair color is the result of the _____ pigment found within the cortex.

melanin

The cortex is the _____ layer of the hair

middle

Salt bonds depend on PH and account for _ of the hairs total strength.

one third

Animal parasites cause _____ and scabies

pediculosis capitis

Density is the number of hair strands _____ on the scalp.

per square inch

Red through light blond color hair is provided by

pheomelanin

The main component of hair is a _____ called keratin

protein

The polypeptide chains intertwine around each other to create a coil or spiral of _____.

protein

________ are made up of amino acids

proteins

Pseudofolliculitis barbae is referred to as

razor bumps

The _____ glands secrete sebum.

sebaceous

Vellus or lanugo hair is _____ and appears nearly everywhere on the body

short and fine

The three different types of _____ bonds are hydrogen, salt, and disulfide

side

Ammonium thioglycolate permanent waves and _____ chemical hair relaxers break disulfide bonds

sodium hydroxide

Disulfide bonds are the _____ side bonds in the cortex

strongest

The hair shaft consists of _____ main layers

three

Hair growth is not increased by any of the following except _____.

time of year

The technical term for a _____ is furuncle

to boil

Sebum production is not affected by _____.

to exercise

Hydrogen bonds may be broken by ____

water, dilute alkaline solutions, and neutral solution