Chapter 11 Vocab Test #2

Front 1

Alopecia

Back 1

Abnormal Hair Loss

Front 2

Hair Shaft

Back 2

The portion of hair that projects above the epidermis.

Front 3

Furuncle

Back 3

Boil; acute, localized bacterial infection of the hair follicle that produces constant pain.

Front 4

Hair Porosity

Back 4

Ability of the hair to absorb moisture.

Front 5

Hair Texture

Back 5

Thickness or diameter of the individual hair strand.

Front 6

Hydrogen Bond

Back 6

A weak, physical, cross-link side bond that is easily broken by water or heat.

Front 7

Hair Root

Back 7

Thickness or diameter of the individual hair strand.

Front 8

Anagen Phase

Back 8

Also known as growth phase; phase during which new hair is produced.

Front 9

Fragilitas Crinium

Back 9

Technical term for brittle hair.

Front 10

Cysteine

Back 10

An amino acid formed when 2 cysteine amino acids (with single sulfur) are joined by their sulfur groups or disulfide bond.

Front 11

Dermal Papilla

Back 11

Plural:Dermal Papillae. A small, cone-shaped elevation located at the base of the hair follicle that fits into the hair bulb.

Front 12

Hair Cuticle

Back 12

Outermost layer of hair; consisting of a single overlapping layer of transparent, scale-like cells that look like shingles on a roof.

Front 13

Androgenic Alopecia

Back 13

Also known as androgenetic alopecia hair loss characterized by miniaturization of terminal hair that is converted to vellus hair; in men, it is known as male pattern baldness.

Front 14

Arrector Pili Muscle

Back 14

The small, involuntary muscle in the in the base of the hair follicle.

Front 15

Canities

Back 15

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

Front 16

Eumelanin

Back 16

Provides natural dark brown to black color to the hair and is the dark pigment predominant in black and brunette hair.

Front 17

Catagen Phase

Back 17

The brief transition period between the growth and resting phases of a hair follicle. It signals the end of the growth phase.

Front 18

Hair Bulb

Back 18

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

Front 19

Hair Elasticity

Back 19

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

Front 20

Hair Stream

Back 20

Hair flowing in the same direction, resulting from follicles sloping in the same direction.

Front 21

Hair Density

Back 21

The number of individual hair strands on 1 square inch (2.5 square centimeters) of scalp.

Front 22

Disulfide Bond

Back 22

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