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scientific study of hair
trichology
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Greek word "trichos" means:
hair
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_____ system: hair, skin, and nails
integumentary
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part of hair located under epidermis
hair root
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thicken bulb-like structure on lower part of hair root
hair bulb
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small, cone shaped elevation located at the base of the hair follicle that fits into the hair bulb
dermal papilla
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The sabaceous glands secrete a fatty or an oily substance called
sebum
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oil glands secretes ____ and lubricates skin
sebum
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responsible for creating the shine and the smooth, silky feel of healthy hair
hair cuticle
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the hair shaft that emerges is a nonliving fiber composed of...
keratinized protein
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The major elemnts that make up human hair(carbon, hydrogen, nitrogen, sulfur)
COHNS elements
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units that are joined together end-to-end like pop beads
amino acids
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a long chain of amino acids linked by peptide bonds
polypeptide chain
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side bonds that link polypeptide chains together
hydrogen, salt, disulfide
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side bond that weak, physical; broken by wetting the hair with water
hydrogen bond
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weak, physical, corss-link side bond between adjacent polypeptide chains; they are broken by changes in pH
salt bond
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the lighter pigment that provide natural colors ranging from red and ginger to yellow and blond tones
pheomelanin
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refers to the shape of the hair strand
wave pattern
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what shape cross-section is curly hair
oval
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vellus hair is also known as
lanugo
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3 phases of growth cycles of hair
anagen, catagen, telogen
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growth phase in which new hair is produced
anagen phase
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resting phase, final phase of hair cycle that last until the fully gown hair is shed
telogen
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autoimmune disorder that causes the affected hair follicles to be mistakenly attacked by a perosn's own immune system
alopecia areata
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complete body hair loss
alopecia universalis
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brittle hair
fragilitas crinium
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severe case of dandruff; greasy/waxy scales mixed with sebum that stick to scalp in crusts accompanied by redness and inflammation
seborrheic dermatitis
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tinea is caused by
fungal organisms
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characterized by dry, sulfur-yellow, cuplike crusts on the scalp
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infestation of the hair and scalp with head lice
pediculosis capitis
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boil, an acuted localized bacterial infection
furuncle
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hair diameter that requires more processing
coarse
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ability for the hair to absorb moisture
porosity
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chemical services performed on hair with low porositt require
more alkaline solution
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abilit of the hair to stretch and return to its original lenth without breaking
elasticity
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hair flowing in same direction
hair stream
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dry hair and scalp should be treated with products that contain moisturizers and ____
emollients
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