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Chapter 11- Properties Of the Hair and Scalp

Terms in this set (39)

The study of hair is known as
Trichology
A mature strand of human hair is divided into two principle parts known as the
Hair root and hair shaft
What structure in the skin or scalp encases a hair root
Hair follicle
What is the lowest part of the hair strand?
Hair bulb
What structure is described as a small, cone-shaped elevation located at the bottom of the hair follicle?
Dermal papilla
What small involuntary muscle is attached to the underside of a hair follicle?
Arrector pili
Oil glands of the skin, connected to the hair follicles, are known as
Sebaceous glands
Of the 20 amino acids that make up hair, a person must obtain ____________ of the essential amino acids from daily diet.
Nine
The three main layers of the hair shaft are the
Cuticle, cortex, and medulla
What substance in the cortex gives natural color to the hair?
Melanin
As newly formed cells mature, they fill up with a fibrous ___________, then moved upward, lose their nucleus, and die. This process is called keratinization.
Protein
Normal hair contains__________ percent of the element carbon.
51
Normal hair contains _____________ percent of the element oxygen.
21
In the makeup of normal human hair, what COHNS element is present in the lowest percentage?
Sulfur
The chemical bond that joins amino acids to each other is called a
Peptide bond
In the cortex, a side bond that is easily broken by strong alkaline or acidic solutions is called a ________ bond.
Salt
The cortex contains coloring matter in the form of miniature grains of__________, or pigment.
Melanin
Pheomelanin provides natural hair colors from_________ to yellow and blind tones.
Red and ginger
The shape of a hair strand, described as straight, wavy, curly, or extremely curly, is known as its
Wave patter
Short, fine, downy, unpigmented hair is knows as ________ hair.
Vellus
What place on the body would normally include vellus hair?
Eyelids
Long, coarse, pigmented hair found on the scalp, legs, arms, and body is knows as ___________.
Terminal hair
All hair follicles have the same structure and cycle through the same three phases, which are
anagen (growing), catagen (transitional), telogen (resting)
The loss of hair in round or irregular patches without inflammation is known as
alopecia areata
What treatment has been scientifically proven to increase hair growth and is approved for that purpose by the Food and Drug Administration (FDA)?
Minoxidil
Cantities is the technical term for
Gray hair
The technical term for split ends is
Trichoptilosis
The technical term for the hair that is in a dry, brittle condition with nodular swellings along the hair shaft is
Trichorrhexis nodosa
Monilethrix is the technical term for
Beaded hair
A scalp condition characterized by red applies or spots at the opening of hair follicles is
Tinea capitis
When a client exhibits signs of ____________, salon service should be limited to referring the client to a physician for medical treatment.
scabies
What contagious condition is caused by head lice?
pediculosis capitis
What is the technical term for a boil - an acute, localized bacterial infection of the hair follicle that produces constant pain?
furuncle
What term refers to an infection of the hair follicles frequently caused by staphylococcus or other bacteria?
Folliculitis
Hair texture refers to the __________ of the hair.
thickness or diameter
The number of individual hair strands on one square inch of the scalp indicates hair
density
Hair with low porosity is considered:
resistant
The strength of the side bonds that hold the hair's individual fibers in place is indicated by hair
elasticity
Hair that forms a circular pattern is called a
Whorl
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