Barber Academy Chapter 11

hair
Trichology is the scientific study of_________, including its care and disorders.

protein
The main component of hair is a __________ called keratin.

hair shaft
The part of the hair that extends above the skin surface is the_________.

hair root
The portion of the hair that enclosed within the follicle is the_________.

hair follicle
The dermal papilla is surrounded by the__________.

hair stream
Hair’s natural tendency to flow to one side is called the _________.

lower part of the hair root
The hair bulb is the__________.

oxygen and nutrients
The dermal papilla supplies________ to the tissue that lines the hair follicle.

sebaceous
The_________ glands secrete sebum.

exercise
Sebum production is not affected by__________.

involuntary muscle fiber
The arrector pili is a minute,_________ in the skin attached to the underside and base of the hair follicle.

three
The hair shaft consists of__________ main layers.

scales
Swelling the hair raises the________ of the cuticle layer and opens the spaces between them, allowing liquids to penetrate.

above 7.0
Oxidation tints and other chemicals hair products must have a pH_________.

middle
The cortex is the________ layer of the hair.

cortex
The_________ accounts for about 90 percent of the hair’s weight.

naturally blond
Hair that is missing the medulla is_________.

follicles
Hair_______ mature in a process called keratinization.

keratinized carbohydrate
Visible Hair is not made up of_____________________.

91
Protein makes up________ percent of hair.

hair,skin and nails
The elements in human________ are sulfur, carbon, oxygen, hydrogen, and nitrogen.

51
The chemical composition of average hair is__________ percent carbon.

proteins
_________ are made up of amino acids.

end-to-end
Amino acids are joined_________ by peptide bonds.

peptide
The strongest chemical bonds in the cortex are__________ bonds.

protein
The polypeptide chains intertwine around each other to create a coil or spiral of__________.

cortex
In the_________, polypeptide chain are linked to each other by side bonds.

side
The three different types of__________ bonds are hydrogen, salt and disulfide.

Hydrogen
________ side bonds are easily broken by water or heat.

even a few
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.

body
Hydrogen bonds add________ to the hair and keep parallel polypeptide chains together.

water, dilute alkaline solutions, and neutral solutions
Hydrogen bonds may be broken by_________.

one-third
Salt bonds depend on pH and account for_________ of the hair’s total strength.

strongest
Disulfide bonds are the________ side bonds in the cortex.

cysteine
The atoms of neighboring___________ amino acids that joined together by disulfide bonds are atoms of sulfur.

sodium hydroxide
Ammonium thioglycolate permanent waves and_________ chemical hair relaxers break disulfide bonds.

eumelanin
Black and brown hair colors are provided by_________.

pheomelanin
Red through light blond color hair is provided by_______.

melanin
Natural hair color is the result of the__________ pigment found within the cortex.

140000
Blonds have approximately_________ hairs on the head.

short and fine
Vellus or lanugo hair is________ and appears nearly everywhere on the body.

palms
Secondary terminal hair doesn’t appears on the__________.

inch per month
Healthy hair on the scalp grow about 1/2 _________.

the time of the year
Hair growth is not increased by any of the following except__________.

cowlick
A tuft of hair standing straight up is known as a ________.

catagen
During the________ phase, the hair bulb disappears.

telogen
During the__________ phase, the hair is shed.

90
At any given time, about_________ percent of scalp hair is growing in the anagen phase.

medium
Hair texture is measured by the diameter of the hair strand and is classified as coarse,________, or fine.

coarse
Hair with a__________ texture has the largest diameter.

is most likely to be damaged by chemical services
Fine hair is_______.

per square inch
Density is the number of hair strands________ on the scalp.

porosity
The hair’s________ is its ability to absorb moisture.

low
Resistant hair has________ porosity.

normal
Wet hair with_________ elasticity can stretch up to 50 percent of its original length and return to that length without breaking.

any abnormal hair loss
Alopecia is the technical term for_________.

Androgenic alopecia
_______ 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.

male pattern baldness
Androgenic alopecia in men is also called__________.

areata
Alopecia________ is characterized by hair falling out in round patches.

Minoxidil
________ is a topical treatment that is applied to the scalp twice a day.

an oral medication for hair loss
Finasteride is________.

pityriasis
Dandruff is technically known as_________.

large dry flakes
Scalp irritation,________, and an itchy scalp are characteristic of pityriasis capitis simplex.

Greasy or waxy scales
_______ that stick to the scalp in patches are characteristic of pityriasis steatoides.

Tinea sycosis
________ is a fungal infection that occurs chiefly over the bearded areas.

Dry, sulphur-yellow, cuplike crust
_______ on the scalp are symptoms of tinea favosa.

Pediculosis capitis
Animal parasites cause_________ and scabies.

folliculitis
Sycosis vulgaris,_________ and pseudofolliculitis barbae are staphylococcal infections involving the follicles.

boil
The technical term for a_________ is furuncle.

razor bumps
Pseudofolliculitis barbae is referred to as”__________.”

Hypertrichosis
________ is abnormal hair growth and can be treated in the barbershop.

Canities
________ is caused by loss of natural melanin.

trichoptilosis
Split ends are called___________.

fragilitas crinium
Brittle hair is technically known as_________.