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42 Cards in this Set
- Front
- Back
what is the tube-like depression or pocket in the skin or scalp that contrains the hair root?
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follicle
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what is the lowest area or part of a hair strand?
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hair bulb
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what is the dermal papilla?
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a small coneshaped area located at the base of the hair follicle that fits into the hair bulb
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what contrains the blood and nerve supply thta provides nutrients needed for hair growth?
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dermal papilla
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what are sebaceous glands?
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oil glands of the skin connected to the hair follicles
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name the three main layers of the hair shaft?
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cuticle, cortex, medulla
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what is the outermost layer of the hair?
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cuticle
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what is the middle layer of the hair?
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cortex
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what is the innermost layer and is composed of round cells?
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medulla
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what are the main elements that make up human hair?
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Carbon, oxygen, hydrogen, nitrogen, sulfer (COHNS)
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proteins are made of long chains of?
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amino acids
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what is the chemical bond that links amino acids together?
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peptide bond of end bond
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what is a long chain of amino acids linked by pepide bonds?
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polypeptide
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what is the spiral shape of a coiled protein?
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helix
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polypeptide chains are crosslinked like a ladder by three different types of side bonds. what are they?
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hydrogen, salt and disulfide bonds
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what bond is a weak side bond that can be broken by water or heat?
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hydrogen
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what is a weak bond that can be broken by strong alkaline or acidic solutions?
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salt
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what bond joins the sulfter atoms of two neighboring cysteine amino acids to creat a cystine?
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disulfide
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what bond can only be broken by chemicals?
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disulfide
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what is the thickness or diameter or an individual hair called?
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texture
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what measures the number of individual hair strands
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density
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what is the ability of he hair to absorb moisture?
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porosity
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hair with low porosity is considered ___?
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resistant
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____is the ability of the hair to stretch and return to its orginal length without breaking
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elasticity
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what is the name of the hair that is not pigmented and almost never has a medulla?
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vellus or lanugo
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_____ is the long hair found on the scalp legs arms and bodies of males and females
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terminal hair
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whats the name of the growth phase new hair is produced
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anagen
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the ___ phase is the brief transition period between the growth and resting phases of a hair follicle
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catagen
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the ___ or resting phase is the final phase in the hair cycle and lasts until the fully grown hair is shed
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telogen
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what is abnormal hair loss called?
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alopecia
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what is the technical term for gray hair?
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canities
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what is hypertrichosis?
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a condition of abnormal growth of hair.
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technical term for split ends?
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trichoptilosis
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what is trichrrhexis nodosa?
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brittleness and the formation of nodular swellings along the hair shaft
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what is monilehrix?
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technical term for beaded hair
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what is the tern for brittle hair
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fragilitas crinium
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what is the medical term for dandruff?
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pityriasis
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the medical term for ringworm?
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tinea
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a highly contagious skin disease cause by a parasite called a "mite" that burrows under the skin
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scabies
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the infestation of hair and scalp with head lice
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pediculosis
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a ___ an acute, localized bacterial infection of the hair follicle that produces constant pain
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furuncle
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___an inflammation of subcutaneous tissue cause by staphylococci
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carbuncle
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