Chapter 10

The chemical composition of normal hair is ____ percent carbon.

51

At any given time, about ______ percent of scalp and hair is in the anagen phase.

90

Protein makes up approximately _____ percent of human hair.

90

Finasteride is

An oral medication for hair loss

During which phase is a new hair produced.

Anagen

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

Androgenic alopecia

Alopecia is the technical term for

Any abnormal hair loss

The technical term for gray hair

Canities

______ may stretch up to 50 percent of its original length and return to that length without breaking.

Curly or wavy hair

Which type of hair often has low elasticity, breaks easily, and has a tendency to knot, especially on the ends?

Extremely curly

Brittle hair is technically known as:

Fragilitas crinium

Trichology is the scientific study of:

Hair and its diseases

____ side bonds are easily broken by water or heat.

Hydrogen

_______ is abnormal hair growth and can be treated in the barbershop.

Hypertrichosis

______ is a topical treatment that is applied to the scalp twice a day to stimulate hair growth.

Minoxidil

Dandruff is technically known as _____.

Pityriasis

Split ends are called _____.

Trichoptilosis

Terminal hair is found on ___

a bald scalp

The result of follicles being arranged and sloping in a uniform manner is called ______

a hair stream

Alopecia ______ is characterized by the sudden falling out of hair in round patches.

areata

The technical term for a _______ is furuncle.

boil

During the ______ phase, the hair bulb disappears

catagen

Hair with a _____ texture has the largest diameter.

coarse

The _____ accounts for about 90 percent of the total weight of the hair

cortex

A tuft of hair standing straight up is known as a _____

cowlick

The ______consist of a single overlapping layer of transparent, scale-like cells that look like shingles on a roof.

cuticle

Disulfide bonds join the sulfur atoms of two neighboring ______ amino acids to create one cystine.

cystine

______ on the scalp are symptoms of tinea favosa

dry, sulfur-yellow, cuplike crusts

Amino acids are made of ______

elements

Amino acids are joined ______ in a definite order by peptide bonds.

entoend

Black and brown hair colors are provided by _____

eumelanin

Sebum production is not affected by _____

exercise

African Americans tend to have _______ hair.

extremely curly

Asians and native Americans tend to have _____hair.

extremely straight

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

folliculitis barbae

______ that stick to the scalp in patches are characteristic of pityrasis steatoids

greasy or waxy scales

The essential elements in a human ____ are sulfur, carbon, oxygen, hydrogen, and nitrogen.

hair

Within the _______, polypeptide chains are cross-linked by side bonds.

hair cortex

The dermal papilla is surrounded by the ______

hair follicle

The portion of the hair that is enclosed within the follicle beneath the skin surface is the _____

hair root

The portion of the hair that extends above the skin surface is the ______

hair shaft

Thioglycolate permanent waves and _____ chemical hair relaxers break disulfide bonds.

hydroxide

The average growth rate of healthy hair on the scalp is about 1/2 ______

inch per month

The arrector pili is a minute, ________ in the skin attached to the base of the hair follicle.

involuntary muscle fiber

Fine hair

is more susceptible to damage from chemical services

Scalp irritation, ______ and a itchy scalp are the characteristics of pityriasis capitis simplex

large flakes

Resistant hair has _____ porosity

low

The hair bulb forms the ______

lower part of the hair root

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

Hair that is missing the medulla is _____.

naturally blond

The dermal papilla contains the blood and nerve supply that provides _______ needed for hair growth

nutrients

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

one

The two most common parasitic infestations barbers may see in the barbershop are _______ and scabies.

pediculosis capitis

Hair density refers to the number of individual hair strands of scalp area ____

per square inch

Red and ginger to yellow and light blond hair colors are provided by _____

pheomelanin

The hairs ______ is the ability of the hair to absorb moisture.

porosity

The chief component of hair is a _____ called keratin.

protein

The polypeptide chains intertwine around each other to create the spiral shape of a coiled ______

protein

Pseudofolliculitis barbae is also referred to as

razor bumps

The hair feels _______ when you move your thumb and fingers from its end to the scalp.

rough

Swelling the hair with high-pH products raises the cutucle layer and opens the spaces between the ______, allowing liquids to penetrate into the cortex.

scales

The ______ glands secrete sebum.

sebaceous

Hair ______ mature through a process called keritinization

shafts

Vellus or lanugo hair is _______ and in adults is found in places normally considered hairless.

short and fine

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

side

Disulfide bonds bonds are the _____ side bonds in the cortex

strongest

During the ______ phase, the hair is either shed or remains in place until it is pushed out by the growth of a new hair.

telogen

Hair growth is not increased by any of the following except

the time of the year

Hair shaft consists of ___ main layers

three

______is ringworm of the bearded area

tinea sycosis

What term can be described as straight, wavy, curly, or extremely curly?

wave pattern