Chapter 9 Properties of the Hair & Scalp Review – Flashcards
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follicle
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The pocket or tube-like depression in the scalp or skin that contains the hair root is the:
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hair bulb
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The thickened, club-like structure that forms the lower part of the hair root is the:
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arrector pili
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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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medulla layer
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The three main layers of the hair shaft are the cuticle, cortex, and:
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cuticle layer
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The layer that consists of transparent, scale-like cells that look like shingles on a roof is the:
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cortex layer
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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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elasticity
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The cortex is responsible for the natural color of hair, 90 percent of the total weight, and hair:
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hair follicle
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Hair is composed of protein that grows from cells originating within the:
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keratinized protein
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The hair shaft that emerges from the scalp is a nonliving fiber composed of:
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amino acids
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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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peptide bonds
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Chemical bonds that hold together amino acid molecules are:
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polypeptide chains
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When peptide bonds hold together very long chains of amino acids, it is called a:
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hydrogen, salt, and disulfide bonds
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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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COHNS elements
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The five major elements found in skin, hair, and nails are often referred to as the:
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hydrogen bonds
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A weak, temporary side bond that is easily broken by water and heat is a:
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salt 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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disulfide bonds
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Permanent waving and hair relaxers change the shape of hair by chemically altering the hair's:
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melanin
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All natural hair color is the result of pigment located in the cortex called:
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eumelanin
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The melanin that provides brown or black color to hair is:
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wave pattern
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The term that is used to describe the shape of the hair strand is the:
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texture
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The thickness or diameter of the individual hair strand is referred to as hair:
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coarse
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Hair that has the largest diameter and usually requires more processing time is:
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density
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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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porosity
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The ability of the hair to absorb water or oil is:
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elasticity
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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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hair stream
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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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emollients
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Dry hair and scalp should be treated with products that contain moisturizers and:
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sebaceous glands
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Oily hair and scalp are caused by improper washing or overactive:
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vellus or lanugo
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The short, fine, and downy hair that helps in the efficient evaporation of perspiration is:
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anagen, catagen, and telogen
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The three growth cycles of human hair are:
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1/2 inch per month
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The average growth of healthy scalp hair is about:
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telogen
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The resting phase or final phase of the hair cycle that lasts until the fully grown hair is shed is the:
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alopecia areata
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The sudden falling out of hair in round patches or baldness in spots is:
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canities
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The technical term for gray hair is:
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hypertrichosis
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The condition of abnormal hair growth of terminal hair is referred to as:
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trichorrhexis nodosa
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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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pityriasis
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The medical term that is used to describe dandruff is:
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malassezia
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Current research confirms that dandruff is the result of a fungus called:
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pityriasis steatoides
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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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fungal organisms
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Tinea is characterized by itching scales and sometimes painful circular lesions and is caused by:
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pediculosis capitis
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An infestation of the hair and scalp with head lice is:
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furuncle
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An acute, localized bacterial infection of the hair follicle that produces constant pain is a:
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scabies
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A highly contagious skin disease caused by a parasite called a itch mite is:
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staphylococci
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A carbuncle is an inflammation of the subcutaneous tissue caused by:
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a physician
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A client with seborrheic dermatitis should be to referred to:
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tinea capitis
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The type of fungal infection that is characterized by red papules or spots at the opening of the hair follicle is:
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50%
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Virgin hair, when wet, can be stretched _______ of its length.
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overlapped
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In a diagrammatic sketch of non-porous hair, the scales of the cuticle layer appear to be
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follicle
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What portion of the hair structure gives shape and direction?
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keratin
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One important substance that hair, nails, and skin have in common is
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dermal papilla
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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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