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42 Cards in this Set

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