Chapter 9 Properties of the Hair & Scalp Review

dermal papilla
A small, cone-shaped area located at the base of the hair follicle that fits into the hair bulb is the:
sebum
The substance secreted by the sebaceous glands is called:
trichology
The scientific study of hair, its diseases, and its care is known as:
hair shaft
The part of the human hair that projects above the skin is known as the:
follicle
The pocket or tube-like depression in the scalp or skin that contains the hair root is the:
hair bulb
The thickened, club-like structure that forms the lower part of the hair root is the:
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arrector pili
The tiny, involuntary muscle fiber in the skin inserted in the base of the hair follicle is the:
medulla layer
The three main layers of the hair shaft are the cuticle, cortex, and:
cuticle layer
The layer that consists of transparent, scale-like cells that look like shingles on a roof is the:
cortex layer
The fibrous protein core formed by elongated cells that contains melanin pigment is the:
cortex
A lengthwise section of hair shows that cuticle scales overlap and each individual cuticle scale is attached to the:
elasticity
The cortex is responsible for the natural color of hair, 90 percent of the total weight, and hair:
hair follicle
Hair is composed of protein that grows from cells originating within the:
keratinized protein
The hair shaft that emerges from the scalp is a nonliving fiber composed of:
amino acids
The units of structure that build protein and are linked end-to-end like a string of pearls are:
peptide bonds
Chemical bonds that hold together amino acid molecules are:
polypeptide chains
When peptide bonds hold together very long chains of amino acids, it is called a:
hydrogen, salt, and disulfide bonds
The three different types of cross-links that form bonds between the polypeptide chains in the cortex are:
COHNS elements
The five major elements found in skin, hair, and nails are often referred to as the:
hydrogen bonds
A weak, temporary side bond that is easily broken by water and heat is a:
salt bond
A temporary side bond between adjacent polypeptide chains that is broken by changes in pH is a:
disulfide bonds
Permanent waving and hair relaxers change the shape of hair by chemically altering the hair’s:
melanin
All natural hair color is the result of pigment located in the cortex called:
eumelanin
The melanin that provides brown or black color to hair is:
wave pattern
The term that is used to describe the shape of the hair strand is the:
texture
The thickness or diameter of the individual hair strand is referred to as hair:
coarse
Hair that has the largest diameter and usually requires more processing time is:
density
The measurement that describes the number of individual hair strands on one square inch of the scalp is:
porosity
The ability of the hair to absorb water or oil is:
elasticity
The ability of hair to stretch and return to its original length without breaking is referred to as hair:
hair stream
Hair flowing in the same direction, the result of follicles sloping in the same direction form a:
emollients
Dry hair and scalp should be treated with products that contain moisturizers and:
sebaceous glands
Oily hair and scalp are caused by improper washing or overactive:
vellus or lanugo
The short, fine, and downy hair that helps in the efficient evaporation of perspiration is:
anagen, catagen, and telogen
The three growth cycles of human hair are:
1/2 inch per month
The average growth of healthy scalp hair is about:
telogen
The resting phase or final phase of the hair cycle that lasts until the fully grown hair is shed is the:
alopecia areata
The sudden falling out of hair in round patches or baldness in spots is:
canities
The technical term for gray hair is:
hypertrichosis
The condition of abnormal hair growth of terminal hair is referred to as:
trichorrhexis nodosa
A condition that is characterized by brittleness and the formation of nodular swellings along the hair shaft is:
pityriasis
The medical term that is used to describe dandruff is:
malassezia
Current research confirms that dandruff is the result of a fungus called:
pityriasis steatoides
A severe type of dandruff characterized by an accumulation of greasy or waxy scalp scales mixed with sebum is:
fungal organisms
Tinea is characterized by itching scales and sometimes painful circular lesions and is caused by:
pediculosis capitis
An infestation of the hair and scalp with head lice is:
furuncle
An acute, localized bacterial infection of the hair follicle that produces constant pain is a:
scabies
A highly contagious skin disease caused by a parasite called a itch mite is:
staphylococci
A carbuncle is an inflammation of the subcutaneous tissue caused by:
a physician
A client with seborrheic dermatitis should be to referred to:
tinea capitis
The type of fungal infection that is characterized by red papules or spots at the opening of the hair follicle is:
50%
Virgin hair, when wet, can be stretched _______ of its length.
overlapped
In a diagrammatic sketch of non-porous hair, the scales of the cuticle layer appear to be
follicle
What portion of the hair structure gives shape and direction?
keratin
One important substance that hair, nails, and skin have in common is
dermal papilla
A small, cone-shaped area located at the base of the hair follicle that fits into the hair bulb is the: