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The scientific study of hair, its diseases, and care is called:

trichology

The two parts of a mature hair strand are the hair shat and:

hair root

The portion of hair that projects above the skin is the:

hair shaft

The follicle, bulb, papilla, arrector pili muscle, and sebaceous glands are main structures of the:

hair root

The tubelike depression or pocket in the skin or scalp that contains the hair root is the:

follicle

Hair follicles are not found on the palms of the hands or the:

soles of the feet

The follicle extends downward from the epidermis, where it sorruonds the:

dermal papilla

The lowest area or part of the hair strand is the:

hair bulb

A small, cone-shaped area at the base of the hair follicle that fits into the hair bulb is the:

dermal papilla

A tiny, involutary muscle fiber iserted in the base of the hair follicle is the:

arrector pili

The oil glands of the skin connected to the hair follicles are:

sebaceous glands

An oily substance secreted from the sebaceous glands is:

sebum

The overlapping layer of hair with transparent, scalelike cells is the:

cuticle

The three main layers of the hair shaft are the cuticle, medula, and:

cortex

Swelling the hair raises the cuticle

penetration

For chemicals to penetrate a healthy cuticle hair layer, they must:

have an alkaline ph

The fibrous protein core of the hair, formed by elongated cells containing melanin pigment, is the;

cortex layer

The medulla is the innermost layer of the hair and is composed of:

round cells

Hair is composed of protein that grows from cells originating within the:

hair follicle

The process whereby living cells mature and begin their journey up the hair shaft is:

kerantinization

The five main elements that make up the chemical composition of human hair are Carbon, oxygen, hydrogen, and:

nitrogen and sulfur

The chemical bonds that hold together the amino acid molecules are:

peptide bonds

An end bond is also known as a (n)

peptide bond

When peptide bonds hold together a very long chain of amino acids, it is called a:

polypeptide chain

The three types of cross-links that form the bonds between the polypeptide chains are hydrogen bonds, saalt bonds, and:

disulfide bonds

A weak type of pysical side bond that is easily broken by water or heat is a (n):

hydrogen bond

A salt bond is easily broken with the use of:

strong alkaline or acidic solutions

Bonds that must be chemically separated are:

disulfide bonds

Hydrogen chemical hair relaxers break disulfide bonds and during rinsing convert them to:

lanthionine bonds

The natural hair pigment found in the cortex layer of the hair is:

melanin

Two different types of melanin are eumelanin and:

pheomelanin

Natural wave pattern are the result of:

genetics

Asians tend to have:

extremly straight hair

Extremely curly hair grows:

in long twisted spirals

To help minimize tangles in extremly curly hair when washing, you should use:

detangling rinse

Extremly curly hair may often break or knot easily due to:

low elasticity

Four important factors to consider in hair analysis are texture and porosity:

elasticity and density

The thickness or diameter of the individual hair strand is the:

hair texture

Hair texture is classified as:

coarse, medium, or fine

The measurment of individual hair strands on one square inch of the scalp is:

hair density

The ability of the hair to absorb water or oil is:

porosity

Chemical service performed on hair with low porosity require:

more alkaline solutions

Hair with high porosity often the result of:

overprocessing

The ability of the hair to strech and return without breaking is:

elasticity

Wet hair with normal elasticity will strech up to:

50 percent

When shaping and styling hair, consider the hair's:

natural growth patterns

Dry hair and scalp can be caused by:

inactive sebaceous glands

Oily scalp and hair can be treated by properly shampooing with:

normalizing shampoo

Hair that is not pigmented and almost never has a medulla is:

vellus

Long, soft hair found on the scalp, legs, arms and bodies of males and females is:

terminal

The phases of hair growth are anagen, catagen, and:

telogen

The growth phase where new hair is produced is:

anagen

The averange growth of healthy scalp hair is:

one inch per month

The final or resting phase in the hair growth cycle is:

telogen stage

In general, the cross sections of curly hair can be:

oval

The term used to indentify abnormal hair loss is:

alopecia

The sudden falling out of hair in round patches or baldness in spots is called:

alopecia areata

Two products approved by the FDA to stimulate hair growth and allowed for sale in the United States are:

minoxidil and finasteride

The technical term used to describe gray hair is:

canities

A variety of canities, characterized by alternating bands of gray and pigmented hair, is:

ringed hair

A condition of abnormal hair growth on areas of the body is:

hypertrichosis

Trichorrhexis nodosa is characterized by brittleness of the hair and the formation of:

swellings along the hair shaft

The technical term used to describe beaded haor is:

monilethrix

The medical term for dandruff is:

pityriasis

The medical term used to describe a fungal organism characterized by iching, scales, and painful circular lesions is:

tinea

The type of fungal infection characterized by red papules at the opening of the hair follicles is:

tinea capitis

A highly contagious skin disease caused by a mite parasites is:

scabies

An acute localized bacterial infection of the hair follicle that produces constant pain is:

a furuncle

An inflammation of the subcutaneous tissue caused by staphylococci is:

a carbuncle

The spread of diseases can be prevented by practicing approved:

sanitation and disinfection procedures

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