Prop. Hair & Scalp: Structure

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

• anagen phase

• amino acids

• catagen phase

• alopecia

The five elements—carbon, oxygen, hydrogen, nitrogen, and sulfur—that make up human hair, skin, tissue, and nails.

• cortex

• canities

• cystine

• COHNS

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

• bulb

• cuticle

• cortex

• cysteine

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

• anagen phase

• catagen phase

• cystine

• COHNS

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

• bulb

• follicle

• root

• cuticle

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

a ladder.

• hydrogen bond

• furuncle

• disulfide bond

• carbuncle

The part of the hair located below the surface of the epidermis.

• follicle

• bulb

• root

• shaft

Units that are joined together end to end like pop beads by strong, chemical peptide bonds (end bonds) to form the polypeptide chains that comprise proteins.

• cysteine

• amino acids

• disulfide bond

• COHNS

Units that are joined together end to end like pop beads by strong, chemical peptide bonds (end bonds) to form the polypeptide chains that comprise proteins.

• cysteine

• amino acids

• disulfide bond

• COHNS

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

• catagen phase

• anagen phase

• alopecia

• canities