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51 Cards in this Set
- Front
- Back
a small, cone-shaped area located at the base of the hair follicle that fits into the hair bulb is the:
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dermal papilla
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the substance secreted by the sebaceous glands is called:
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sebum
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the scientific study of hair, its diseases, and its care is known as:
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trichology
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the part of the human hair that projects above the skin is known as the:
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hair shaft
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the pocket or tubelike depression in the scalp or skin that contains the hair root is the:
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follicle
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the thickened, clublike structure that forms the lower part of the hair root is the:
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hair bulb
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the tiny, involuntary muscle fiber in the skin inserted in the base of the hair follicle is the:
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arrector pili
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the three main layers of the hair shaft are the cuticle, cortex and the:
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medulla
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the layer that constists of transparent, scalelike cells that look like shingles on a roof is:
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the cuticle
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the fibrous protein core formed by elongated cells that contains melanin pigment is the:
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cortex
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a lengthwise section of hair shows that cuticle scales overlap and each individual cuticle scale is attached to the:
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cortex
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the cortex is responsible for the natural color of hair, 90% of the total weight, and hair:
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elasticity
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the medulla, the innermost layer of the hair, is composed of cells that are:
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round
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hair is composed of protein that grows from cells originating within the:
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hair follicle
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the hair shaft that emerges from the scalp is a nonliving fiber composed of:
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keratinized protein
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the units of structure that build protein and are linked end-to-end like a string of pearls are:
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amino acids
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chemical bonds that hold together amino acid molecules are:
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peptide bonds
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when peptide bonds hold together very long chains of amino acids, it is called:
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polypeptide chain
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the three different types of cross-links that form bonds between the polypeptide chains in the cortex are:
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hydrogen, salt and disulfide bonds
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the five major elements found in skin, hair, and nails are often referred to as the:
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COHNS elements
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COHNS elements
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Carbon 51%
Oxygen 21% hydrogen 6% nitrogen 17% sulfur 5% |
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a weak, temporary side bond that is easily broken by water and heat is a:
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hydrogen bond
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a temporary side bond between adjacent polypeptide chains that is broken by changes in pH is a:
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salt bond
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permanent waving and hair relaxers change the shap of hair by chemically altering the hair's:
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disulfide bonds
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hydroxide chemical relaxers break disulfide bonds and convert then to:
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lanthionine bonds
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all natural hair color is the result of pigment located in the cortex called:
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melanin
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the melanin that provides brown or black color to hair is:
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eumelanin
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the term that is used to describe the shape of the hair strand is the:
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wave pattern
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the thickness or diameter of the individual hair strand is referred to as hair:
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texture
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hair that has the largest diameter and usually requires more processing time is:
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coarse hair texture
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the measurement that describes the number of individual hair strands on one square inch of the scalp is:
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density
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the ability of the hair to absorb water or oil is:
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porosity
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the ability of hair to stretch and return to its original length without breaking is referred to as hair:
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elasticity
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hair flowing in the same direction, the result of follicles sloping in the same direction form a:
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hair stream
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dry hair and scalp should be treated with products that contain moisturizers and:
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emollients
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oily hair and scalp are caused by improper washing or overactive:
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sebaceous glands
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the short, fine and downy hair that helps in the efficient evaporation of perspiration is:
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vellus hair
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the three growth cycles of human hair are:
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anagen, catagen, telogen
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the average growth of healthy scalp hair is about:
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1" per month
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the sudden falling out of hair in round patches or baldness in spots is:
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alopecia areata
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the technical term for gray hair is:
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canities
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the condition of abnormal hair growth is referred to as:
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hypertichosis
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a condition that is characterized by brittleness and the formation of nodular swellings along the hair shaft is:
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trichorrhexis nodosa
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the medical term that is used to describe dandruff is:
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pityriasis
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current research confims that dandruff is the result of a fungus called:
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malassezia
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a severe type of dandruff characterized by an accumulation of greasy or waxy scalp scales mixed with sebum is:
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pityriasis steatoides
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an infestation of the hair and scalp with head lice is :
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pediculosis capitis
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an acute, localized bacterial infection of the hair follicle that produces constant pain is a:
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furuncle (boil)
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a highly contagious skin disease caused by a parasite called a mite is:
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scabies
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a carbuncle is an inflammation of the subcutaneous tissue caused by:
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staphylococci
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a client with seborrheic dermatitis should be referred to:
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a physician
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