Trichology is the scientific study of_________, including its care and disorders.
The main component of hair is a __________ called keratin.
The part of the hair that extends above the skin surface is the_________.
The portion of the hair that enclosed within the follicle is the_________.
The dermal papilla is surrounded by the__________.
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.
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.
Hair that is missing the medulla is_________.
Hair_______ mature in a process called keratinization.
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.
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_________.
_______ 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
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.
________ is a fungal infection that occurs chiefly over the bearded areas.
Dry, sulphur-yellow, cuplike crust
_______ on the scalp are symptoms of tinea favosa.
Animal parasites cause_________ and scabies.
Sycosis vulgaris,_________ and pseudofolliculitis barbae are staphylococcal infections involving the follicles.
The technical term for a_________ is furuncle.
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___________.
Brittle hair is technically known as_________.