CHAPTER 9 PROPERTIES OF HAIR

Abnormal hair loss.

The sudden falling out of hair in round patches or baldness in spots; may occur on the scalp and elswhere on the body.

units that are joined togehter end to end by peptide bonds to form the polypeptide chains that comprise porteins.

growth phase in the cycle in which a new hair shaft is created

hair loss characterized by miniaturization of terminal hair which is converted to vellus hair; in men it is known as male pattern bladness.

minute, involutary muscle in the base of the hair follice that causes "goose bumps"

Technical term for gray hair; results from the loss of the hair's natural melanin pigment

inflammation of the subcutaneous tissue caused by staphylocci; similar to furuncle but larger.

the brief transistion period between the growth and resting phases of a hair follicle

the five elements that make up human hair, skin , tissue and nails ( carbon, oxygen, hyrogen, nitrogen, and sulfur)

middle layer of the hair; a fibrous protein core formed by elongated cells contaiong melanin pigment.

tuft of hair that stands straight up.

outermost layer of hair consisting of a single overlappoing layer of transparent, scale-like cless.

small cone-shaped elevation located at the bace of the hair follicle that fits into the hair bulb

Strong chemical side bonds that join the sulfur atoms of two neighboring cysteine amino acids to create cysine, which joins together two polypeptide strands like rungs on a ladder

melanin that gives brown and black color to hair.

Tube-like depression or pocket in the skin or sclap that contains the hair root

technical term for brittle hair.

boil; acute. localized bacterial infection of the hair follicle.

lowest part of a hair strand; the thickened, club-shaped structure that form the lower part of the hair root.

the number of indiviual hair strands found on 1 square inch of scalp

ability of the hair to stretch and return to its original length without breaking.

ability of the hair to absorb moisture

the part of the hair contained within the follicle, below the surfaces of the scalp.

the portion of hair that projects beyond the skin.

hair flowing in the same direction, resulting from follicles slpoing in the same direction.

thickness or diameter of the indiviual hair strands

spiral shape created by polypeptide chains that intetwine around each other

weak physical side bond that is easily broken by wather or heat.

condition of abnormal growth of hair, charaterized by the growth of terminal hair in areas of the body that normally grow only vellus hair.

largest and fastest growing organ of the body; composed of the hair skin and nails.

process by which newly formed cells in the hairr bulb mature, fill with keratin, move upward, lose their nucleus, and die.

naturally occuring fungus that is present on all human skin, and is responsible for dandruff.

innermost lyer of the hair, composed of round cells, often abesnt in fine hair.

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

technical term for beaded hair

infestation of the hair and scalp with head lice.

chemical that joins amino acids to each other, end to end, to form polypeptide chain.

melanin that provides natural hair colors from red and ginger to yellow/blond tones.

dandruff; and infalmmation of the skin characterzied by formation and flakin of fine, thin scales.

technical term for classic dandruff; characterized by scalp irritaion . large flakes. and itchy scalp.

scalp inflammation marked by fatty(greasy or waxy) types of dandruff.

long china of amino acids linked by peptide bonds

temporary hair loss experiences at the conclusion of pregnancy

variety of canites characterized by alternating bands of gray and pigmented hair throughout the length of the hair strand

a weak, temporary side bond between adjacent polypeptide chains.

hichly contagious disease caused by mites that burrow under the skin.

dry, sulfur-yellow, cup-like crusts on the scalp in tinea favosa or favus.

oil glands of the skin connected to hair follicles.

medical term for pityriasis steatioides accompanied by redness and inflammation.

oily secretion ofthe sevaceous flands, which lubricates the hair and skin

resting phase; the final phase in the hair cycle that lasts until the fully grown hair is shed.

About 10% of sclap hair is in the telogen phase at any one time

long hair found on the scalp, as well as on legs, arm, and body of both males and females

medical term for ringworm a contagious conditon caused by fungal infection

fungal infection characterized by red papules, or spots at the opening of hair follicles

fungal infection caraterized by ry , sulfur-yellow, cup-like crusts on the scalp, called scutula.

science dealing with the study of hair its diseses and care.

technical term for split ends.

knotted hair characterized by brittleness and the formation of nodular swellings along tha hair shaft.

short, fine, unpigmented downing hair that appears on the body, with the exception of the palms of the hands and the soles of the feet

amount of "movement" in the hair strand; described as straight, wavy, curly, and extermely curly.

hair that forms in a circular pattern, as on the crown.