Barber Academy Chapter 11

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

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.

The_________ glands secrete sebum.

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.

The hair shaft consists of__________ main layers.

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_________.

The cortex is the________ layer of the hair.

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

naturally blond
Hair that is missing the medulla is_________.

Hair_______ mature in a process called keratinization.

keratinized carbohydrate
Visible Hair is not made up of_____________________.

Protein makes up________ percent of hair.

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

The chemical composition of average hair is__________ percent carbon.

_________ are made up of amino acids.

Amino acids are joined_________ by peptide bonds.

The strongest chemical bonds in the cortex are__________ bonds.

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

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

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

________ 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.

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_________.

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

Disulfide bonds are the________ side bonds in the cortex.

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.

Black and brown hair colors are provided by_________.

Red through light blond color hair is provided by_______.

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

Blonds have approximately_________ hairs on the head.

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

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__________.

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

During the________ phase, the hair bulb disappears.

During the__________ phase, the hair is shed.

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

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

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.

The hair’s________ is its ability to absorb moisture.

Resistant hair has________ porosity.

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__________.

Alopecia________ is characterized by hair falling out in round patches.

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

an oral medication for hair loss
Finasteride is________.

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.

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

The technical term for a_________ is furuncle.

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

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

________ is caused by loss of natural melanin.

Split ends are called___________.

fragilitas crinium
Brittle hair is technically known as_________.

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