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Cosmetology Ch 9
Properties of the hair and scalp
Question | Answer |
---|---|
The scientific study of hair, it's diseases, and care is called | trichology |
The two parts of a mature hair strand are the hair shaft and | hair root |
The portion if the hair the projects above the skin is the | hair shaft |
The follicle, bulb, arrector pili muscle, and the 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 fee |
The follicle extends downward from the epidermis, where it surrounds 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, involuntary muscle fiber inserted in the base of the hair follicle is the | arrector pili |
The oil glands of the skin connected to the hair follicles are | sebacaeous 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, medulla, and | cortex |
Swelling the hair raises the cuticle layer and allows for | 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 a protein that grows from cells originating within the | hair follicle |
The process by 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 | nitrogen and sulfur |
The chemical bonds that hold together the amino acid molecules | peptide bonds |
An end bond is also known as a | peptide bond |
When peptide bonds hold together a very long chain of amino acids, it is called a | polypeptide chain |
The three tupes of cross-links that form the bonds between the polypeptide chains are hydrogen bonds, salt bonds and | disulfide bonds |
A week type of physical side bond that is easily broken by water or heat is a | hydrogen bond |
A salt bond is easily broken by use of | strong aklaline 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 patterns are the result of | genetics |
Asians tend to have | extremely straight hair |
extremely curly hair grows | in long twisted spirals |
to help minimize tangles in extremely curly hair when washing you should use | a detanglinig rinse |
Extremely 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 measurement 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 services performed on hair with low porosity require | more alkaline solutions |
Hair with high porosity is often the result of | over-processing |
The ability of the hair to stretch and return without breaking is | elasticity |
Wet hair with normal elasticity will stretch up to | 50 percent |
When shaping and styling hair, consider the hair's | natural growth pattern |
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 average growth of healthy scalp hair is | on half inch per month |
The final of resting phase in the hair growth cycle is | telogen stage |
In general, the cross section of curly hair can be | oval |
The term used to identify 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 | canties |
A variety of canties, characterized by alternating bands of gray and pigmented hair is | ringed hair |
A condition of abnormal hair growth on areas on 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 hair is | monilethrix |
The medical term for dandruff is | pityriasis |
The type of fugal infection characterized by red papules at the opening of the hair follicles is | tinea captis |
A highly contagious skin disease caused by a mite parasite 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 staphyloccocci is | carbuncle |
The spread of diseases can be prevented by practicing approved | sanitation and disinfection procedures |