Scalp
What is the study of hair and its diseases called?
trichology
Which part of the hair is located above the epidermis?
shaft
What is the function of the hair follicle?
anchoring the hair in the skin
What is another name for the hair shaft?
hair strand
What is the function of the cuticle?
to protect the cortex
What does the cortex of the hair provide?
strength
Which type of hair always contains a medulla?
beard hair
What is the primary building-block protein of hair?
keratin
What happens to the cuticle during chemical services?
it softens and swells
Which side bond is broken by water or heat?
hydrogen bond
Which side bond is the strongest?
disulfide bond
Which type of melanin produces yellow-to-red hair tones?
pheomelanin
What determines the shape of the hair strand (wave pattern)?
the shape of the hair follicle
What does hair porosity refer to?
hair's ability to absorb moisture
What does hair density refer to?
strands per square inch of scalp
What are the three components used to test elasticity, porosity, and density?
front hairline, temple, crown, and nape
What is the primary function of vellus hair?
helps with evaporation of perspiration
What is the first, active-growth phase of the hair cycle?
anagen phase
What happens during the catagen phase?
the follicle canal shrinks
Which type of body hair covers a fetus and sheds within weeks of birth?
lanugo hair
What is alopecia?
the partial or complete loss of hair
What can cause androgenic alopecia?
genetics
What is temporary hair loss after pregnancy called?
postpartum alopecia
What two medications are FDA-approved to stimulate hair growth?
minoxidil and finasteride
What is the technical term for gray or white hair?
canities
What autoimmune disorder causes round or irregular patches of hair loss?
alopecia areata
What are the two more advanced forms of alopecia areata?
alopecia totalis and alopecia universalis
Which hair disorder shows alternating bands of gray and pigmented hair?
ringed hair
What is the technical term for split ends?
trichoptilosis
Which hair disorder is caused by a gene mutation and has no recognized treatment?
monilethrix
What is a possible treatment for hypertrichosis?
electrolysis
What is the primary cause of dandruff?
a specific fungus (Malassezia)
What is the technical term for dandruff?
pityriasis
What is the technical term for ringworm?
tinea
What causes tinea?
a fungal organism
Which of the following is a parasitic infection?
scabies
What causes scabies?
mites
What is a furuncle?
a boil
Which of the two main dandruff types CAN be treated in the barbershop?
pityriasis capitis simplex
A long chain formed when amino acids link end-to-end via peptide bonds; these chains coil into a spiral shape called a helix.
Polypeptide Chain
The melanin pigment consisting of brown and black tones; the predominant pigment in black and brunette hair.
Eumelanin
Hair flowing in the same direction because the follicles beneath it slope the same way.
Hair Stream
A tuft of hair that grows straight up or at a different angle than the surrounding hair, most noticeable at the crown.
Cowlick
Redness and inflammation accompanying oily, crusted dandruff; resembles a rash and can appear in eyebrows or beard.
Seborrheic Dermatitis
Inflammation or infection of hair follicles -- small red bumps or white-headed pimples.
Folliculitis