Chapter #10: Properties and Disorders of the Hair and Scalp
cowlick
A tuft of hair standing straight up is known as a ________.
extremely curly
African Americans tend to have_____hair.
any abnormal hair loss
Alopecia is the technical term for_________.
areata
Alopecia________ is characterized by hair falling out in round patches.
endtoend
Amino acids are joined_______in a definite order by peptide bonds.
elements
Amino acids are made of________.
male pattern baldness
Androgenic alopecia in men is also called__________.
extremely straight
Asians and Native Americans tend to have_____hair.
90
At any given time, about______percent of scalp hair is in the anagen phase.
eumelanin
Black and brown hair colors are provided by_____.
fragilitas crinium
Brittle hair is technically known as_________.
pityriasis
Dandruff is technically known as_________.
strongest
Disulfide bonds are the________ side bonds in the cortex.
cysteine
Disulfide bonds join the sulfur atoms of two neighboring _____amino acids to create one cystine.
catagen
During the____phase, the hair bulb disappears.
telogen
During the____phase, the hair is either shed or remain in place until it is pushed out by the growth of a new hair.
Anagen
During which phase is new hair produced?
an oral medication for hair loss
Finasteride is________.
is more susceptible to damage from chemical services.
Fine hair______.
per square inch
Hair density refers to the number of individual hair strands_____of scalp area.
the time of the year
Hair growth is not increased by any of the following except_________.
medium
Hair texture is measured by the diameter of the hair strand and is classified as coarse,_____or fine.
naturally blond
Hair that is missing the medulla is_________.
coarse
Hair with a______texture has the largest diameter.
shafts
Hair_____mature through a process called keratinization.
melanin
Natural hair color is the result of the_____pigment found within the cortex.
90
Protein makes up approximately___percent of human hair.
razor bumps
Pseudofolliculitis barbae is also referred to as______.
pheomelanin
Red and ginger to yellow and light blond hair colors are provided by____.
low
Resistant hair has______porosity.
one-third
Salt bonds depend on pH and account for_________ of the hair's total strength.
large flakes
Scalp irritation, ______, and an itchy scalp are characteristics of pityriasis capitis simplex.
exercise
Sebum production is not affected by______.
trichoptilosis
Split ends are callled______.
scales
Swelling the hair with high-pH products raises the cuticle layer and opens the spaces between the_____, allowing liquids to penetrate into the cortex.
folliculitis barbae
Sycosis vulgaris,______, and pseudofolliculitis barbae are staphyloccal infections involving the follicles.
the arms
Terminal hair is found on______.
involuntary muscle fiber
The arrector pili is a minute,_________ in the skin attached to the base of the hair follicle.
inch per month
The average hair growth rate of healthy hair on the scalp is about 1/2________.
51
The chemical composition of normal hair is_____percent carbon.
protein
The chief component of hair is a _______called keratin.
middle
The cortex is the____layer of the hair.
the nutrients
The dermal papilla contains the blood and nerve supply that provides_____needed for hair growth.
hair follicle
The dermal papillae is surrounded by the______.
hair
The essential elements in human____ are sulfur, carbon, oxygen, hydrogen and nitrogen (COHNS).
lower part of the hair root
The hair bulb forms the__________.
rough
The hair feels_____when you move your thumb and fingers from its end to the scalp.
three
The hair shaft consists of____main layers.
porosity
The hair`s_____is the ability of the hair to absorb moisture.
protein
The polypeptide chain intertwine around each other to create the spiral shape of a coiled_____.
hair shaft
The portion of the hair that extends above the skin surface is the_______.
hair root
The portion of the hair that is enclosed within the follicle beneath the skin surface is the______.
a hair stream
The result of follicles being arranged and sloping in a uniform manner is called_______.
boil
The technical term for a _____is furuncle.
side
The three types of____bonds are hydrogen, salt, and disulfide bonds.
pediculosis capitis
The two most common parasitic infections barbers may see in the barbershop are________and scabies.
sebaceous
The______glands secrete sebum.
cortex
The_____accounts for about 90% of the total weight of the hair.
cuticle
The_____consists of a single overlapping layer of transparent, scale-like cells that look like shingles on a roof.
hydroxide
Thioglycolate permanent waves and_____chemical hair relaxers break disulfide bonds.
hair
Trichology is the scientific study of_____, its disorders, and its care.
short and fine
Vellus or lanugo hair is________ and in adults is found in places normally considered hairless.
wave pattern
What term can be described as straight, wavy, curly, or extremely curly?
Extremely curly.
Which type of hair often has low elasticity, breaks easily, and has a tendency to knot, especially on the ends?
hair cortex
Within the_____, polypeptide chains are cross-linked by side bonds.
Minoxidil
______is a topical treatment that is applied to the scalp twice a day to stimulate hair growth.
Androgenic alopecia
______is hair loss that occurs as a result of genetics, age, and hormonal changes that cause miniaturization of terminal hair, converting it to vellus hair.
Hair with normal elasticity
______may stretch up to 50% of its original length and return to that length without breaking.
Dry, sulfur-yellow, cuplike crusts
______on the scalp are symptoms of tinea favosa.
Greasy or waxy scales
_____that stick to the scalp in patches are characteristic of pityriasis steatoides.
Hypertrichosis
____is abnormal hair growth and can be related in the barbershop.
Tinea sycosis
____is ringworm of the bearded area.
Canities
____is the technical term for gray hair.
Hydrogen
____side bonds are easily broken by water or heat.