Hair Root
tube-like depression or pocket in the skin or scalp that contains the hair root
Hair Follicle
outermost layer of the hair. It consists of a single overlapping layer of transparent, scale-like cells that look like shingles on a roof
Hair Cuticle
Proteins are made of long chains of ________ _______, units that are joined together end-to-end like pop beads.
Amino Acids
also known as growth phase, new hair is produced.
Anagen Phase
is the thickness or diameter of the individual hair strand
Hair Texture
the thickened, club-shaped structure that forms the lower part of the hair root.
Hair Bulb
is the middle layer of the hair. It is a fibrous protein core formed by elongated cells containing melanin pigment. About 90 percent of the total weight of hair comes from the
Hair Cortex
The strong, chemical bond that JOIN amino acids is
Peptide Bond
is the brief transition period between the growth and resting phases of a hair follicle.
Catagen Phase
measures the number of individual hair strands on one square inch of scalp. It indicates how many hairs there are on a person’s head
Hair Density
is a small, cone-shaped elevation located at the base of the hair follicle that fits into the hair bulb.
Dermal Papilla
is the innermost layer of the hair generally found in male beards and coarse hair
Hair Medulla
A long chain of amino acids linked by peptide bonds is called a
Polypeptide chain
also known as resting phase, is the final phase in the hair cycle and lasts until the fully grown hair is shed.
Telogen
is the ability of the hair to absorb moisture.
Porosity
is the small, involuntary muscle in the base of the hair follicle
Arrector Pili Muscle
is the portion of the hair that projects above the epidermis (skin)
Hair Shaft
is a weak, physical, cross-link side bond that is easily broken by water or heat.
Hydrogen Bond
Brown and Black melanin pigment is called
Eumelanin
is the ability of the hair to stretch and return to its original length without breaking
Elasticity
oil glands in the skin that are connected to the hair follicles. Secretes an oil called Sebum
Sebaceous Gland
The scientific study of hair and its diseases and care is called
is a strong, chemical, side bond that can only be broken by chemicals
Disulfide Bond
Yellow and Red melanin pigment is called
Pheomelanin
is hair flowing in the same direction, resulting from follicles sloping in the same direction.
Hair Stream