chapter 11

the hair root, and hair shaft

a mature strand of human hair is divided into two principle parts known as the

an ionic

a side bond that is easily broken by strong alkaline or acidic solutions is a called --------- bond

Arrector Pilli

a small involuntary muscle attached to the underside of a hair follicles is the

dermal papilla

a small, cone-shaped elevation located at the bottom of the hair follicle is the

bulb

a thickened, club shaped structure that forms the lower part of the hair root is called the

hair follicle

a tube like depression, or pocket in the skin or scalp that encases the hair root is called

cuticle cortex and medulla

hair is composed of cells arranged in three layers which are

thickness or diameter

hair texture refers to the ------------ of the hair

whorl

hair that forms a circular pattern is called a

51%

normal hair contains ---------- percent of the element carbon

17%

normal hair contains ----------- percent of the element nitrogen

6%

normal hair contains -------------- percent of the element hydrogen

21%

normal hair contains --------------- percent of the element oxygen

sebaceous glands

oil glands of the skin, connected to the hair follicles, are known as

Porosity

the ability of the hair to absorb moisture is called

Porosity

the ability of the hair to stretch and return to its original form without breaking is called

11

the body can produce ----------- of the 20 amino acids that make up hair and your diet must include the remaining essential amino acid

peptide bond

the chemical bond that joins amino acid to each other is called a

Melanin

the cortex contains coloring matter in the form of minute grains of -------- or pigment

texture

the thickness or diameter of the individual hair strand is called

...

----------- is the tiny grains of pigment in the cortex that give natural color to the hair

...

------------- is a topical medication that is applied to the scalp twice daily and has been proven to stimulate hair growth

...

---------------- is an oral prescription medication for hair loss that is available to men only

Protein

as newly formed cells mature, they fill up with a fibrous ----------- then move upwards, lose their nucleus, and die. this process is called keratinization.

ANAGEN (GROWING), CATAGEN (TRANSITIONAL), TELOGEN (RESTING)

all hair follicles have the same structure and cycle through the same three phases, which are

Furuncle, Boils appear in the dermis and epidermis and are caused by:

an acute staphylococci infection of a hair follicle that produces constant pain is

Terminal hair

long, coarse, pigmented hair found on the scalp, legs, arms, and body is known as

red and ginger

pheomelanin provides natural hair colors from ----------- to yellow and blond tones.

Vellus Hair

short, fine, downy, unpigmented hair is known as -------------- hair

pediculosis capitis

the infestation of the hair and scalp with head lice is known as

alopecia areata

the loss of hair in round or irregular patches without inflammation is called

Density

the number of individual hair strands on one square inch of the scalp indicates -----------

wave pattern

the shape of the hair strand described as straight, wavy, curly, or extremely curly, is known as ------------

trichology

the study of hair is known as

trichorrhexis nodosa

the technical term for hair that is in a dry, brittle condition including formation of nodular swellings along the hair shaft is

trichoptilosis

the technical term for split ends is

ringed hair

the technical term for the gray hair is

monilethrix

the technical term tor beaded hair is

A fungal infection of the scalp characterized by red papules, or spots at the opening of the hair filicles

tinea capitis

42. The infestation of the hair and scalp with head lice is called:, Head lice

tinea favosa