Chapter 11: Properties and Disorders of Hair and Scalp
Blonds have approximately ____ hairs on the head.
140,000 (pg 248)
The chemical composition of average hair is ____ % carbon.
51
At any given time, about ____ percent of scalp hair is growing in the anagen phase.
90
Protein makes up _____ % of the hair.
91
_____ is hair loss that occurs as a result of genetics, age, and hormonal changes that cause the miniaturization of terminal hair, converting it to vellus hair.
Androgenic alopecia
____ is caused by loss of natural melanin.
Canities
____ on the scalp are symptoms of tinea favosa.
Dry, sulfur yellow, cuplike crusts
_____ that stick to the scalp in patches are characteristic of pityriasis steatoides.
Greasy or waxy scales
Trichology is the scientific study of ____, including its care and disorders.
Hair
The dermal papila is surrounded by the ____.
Hair Bulb
The portion of the hair that is enclosed within the follicle is the
Hair Root
The part of the hair that extends above the skin surface is the
Hair Shaft
Hair's natural tendency to flow to one side is called the
Hair stream
_____ side bonds are easily broken by water or heat.
Hydrogen
____ is abnormal hair growth and can be treated in the barbershop.
Hypertrichosis
The hair bulb is the
Lower part of the hair root
______ is a topical treatment that is applied to the scalp twice a day.
Minoxidil
The main component of hair is a ____ called keratin.
Protein
The ___ glands secrete sebum.
Sebaceous
____ is a fungal infection that occurs chiefly over the bearded area
Tinea sycosis
Oxidation tints and other chemical hair products must have a pH ___.
above 7.0
Finasteride is _____.
an oral medication for hair loss
Alopecia is the technical term for ____.
any abnormal hair loss
Alopecia ____ is characterized by hair falling out in round patches.
areata
Hydrogen bonds add ___to the hair and keep parallel polypeptide chains together.
body
The technical term for a ____ is a furuncle.
boil
During the ____ phase, the hair bulb disappears.
catagen
Hair with a ____ texture has the largest diameter.
coarse
In the ____, polypeptide chains are linked to each other by side bonds.
cortex
The ___ accounts for about 90% of the hairs weight
cortex
A tuft of hair standing straight up is known as a ____.
cowlick
The atoms of neighboring ____ amino acids that are joined together by disulfide bonds are atoms of sulfur.
cyseteine
Amino acids are joined _____ by peptide bonds.
end-to-end
Black and brown hair colors are provided by ____.
eumelanin
When ___ bonds are broken through overstretching or the use of strong acidic or alkaline solutions, the hair can be weakened or damaged to the point of breakage.
even a few
Sebum production is not affected by
excercise
Sycosis vulgaris, ____, and pseudofolliculitis barbae are staphylococcal infections involving the follicles.
folliculitis
Brittle hair is technically known as _____.
fragilitas crinium
Healthy hair on the scalp grows about 1/2 ____.
inch per month
The arrector pili is a minute, ____ in the skin attached to the underside and base of the hair follicle.
involuntary muscle fiber
Fine hair ____.
is most likely to be damaged by chemical services
Which of the following statements relating to visible hair is not correct
it is made up of keratinized carbohydrate
Scalp irritation, _____, and itchy scalp are characteristic of pityriasis capitis simplex.
large dry flakes
Resistant hair has ____ porosity.
low
Androgenic alopecia in men is also called ____.
male pattern baldness
Hair texture is measured by the diameter of the hair strand and is classified as course, ____, or fine.
medium
Natural hair color is the result of the ____ pigment found within the cortex.
melanin
The cortex is the ____ layer of the hair.
middle
Hair that is missing the medulla is _____.
naturally blond
Wet hair with ____ elasticity can stretch up to 50% of its original length and return to that length without breaking.
normal
Salt bonds depend on pH and account for ___ of the hair's total strength.
one-third
The dermal papilla supplies ____ to the tissue that line the hair follicle.
oxygen and nutrients
Animal parasites cause ____ and scabies.
pediculosis capitis
The strongest chemical bonds in the cortex are ____ bonds.
peptide
Density is the number of hair strands ____ on the scalp.
per square inch
Red through light blond color hair is provided by ____.
pheomelanin
Dandruff is technically known as ____.
pityriasis
The hair's ____is its ablility to absorb moisture.
porosity
The polypeptide chains intertwine around each other to create a coil or spiral of _____
protein
_____ are made up of amino acids.
proteins
Pseudofolliculitis barbae is referred to as "____".
razor bumps
Swelling the hair raises the ___ of the cuticle layer and opens the spaces between them, allowing liquids to penetrate
scales
Secondary terminal hair appears on the ____.
scalp and beard (pg 268)
Hair ____ mature in a process called keratinization.
shafts
Vellus or lango hair is ____ and appears nearly everywhere on the body.
short and fine
The three different types of ____ bonds are hydrogen, salt and disulfide.
side
The elements in human ____ are sulfur, carbon, oxygen, hydrogen, and nitrogen.
skin, hair, and nails (pg 246)
Ammonium thioglycolate permanent wave and ____ chemical hair relaxers break disulfide bonds.
sodium hydroxide
Disulfide bonds are the ____ side bonds in the cortex.
strongest
During the ____ phase, the hair is shed
telogen
Hair growth is not increased by any of the following except _____.
the time of the year
The hair shaft consists of ____ main layers.
three
Split ends are called ____.
trichoptilosis
Hydrogen bonds may be broken by ____.
water, dilute alkaline solutions, or neutral solutions