Structure of hair
The portion of the hair that projects above the epidermis
Hair root
The lowest part of a hair strand. it is the thickened, club shaped structure that form the lower part of the hair root
Hair bulb
Is the inner most layer of the hair and is composed of round cells.
Medulla
A fibrous protein that grows from cells originating within the hair follicle
Keratin
Bonds that crooks link the polypeptide chains together and are responsible for the extreme strength and elasticity of human hair
Side bonds
The part of the hair located below the surface of the epidermis
Hair root
The tube like depression or pocket in the skin or scalp that contains the hair root
Hair follicle
Is the outermost layer of the hair. It consists of a single overlapping layer of transparent, scalp-like cells that look like shingles on a roof.
Hair cuticle
Process by which newly formed cells in the hair bulb mature, fill with keratin, move upward, lose their nucleus, and die
Kertinlinzation
Weak physical, cross-linked side bond that is easily broken by water or heat
Hydrogen bond
The scientific study of hair and it's diseases and care
Trichology
Small, cone-shaped elevation located at the base of the hair follicle that fits in the bulb
Dermal papilla
Is the middle layer of hair. it is a fibrous protein core formed by elongated cells containing melanin pigment.
Cortex
Units that are joined together end-to-end like pop beads
Amino acids
a weak, physical, cross-link side bond between adjacent polypeptide chains
Salt bond
Are the oil glands in the skin that are connected to the hair follicles.
Sebaceous glands
Long chain of amino acids linked by peptide bonds
polypeptide chain
strong, chemical, side bond that is very different from the physical side bond of a hydrogen bond or salt bond
Disulfide bond
Small, involuntary muscle in the base of the hair follicle
Arrector pili muscle
The five elements- carbon, oxygen, hydrogen, nitrogen, and sulfur- that make human hair, skin, tissue, and nails
COHNS elements