Chapter 11
Cowlick
a particular pattern of hair stream that is usually more noticeable on the front hairline in people with short, thick hair.
Dandruff
a result of fungus.
Hydrogen bonds
a weak, physical, cross-link side bond easily broken by water or heat.
Congenital canities
exists at or before birth.
Healthy cuticle
for chemicals to penetrate the hair layer they must have an alkaline pH.
Anagen phase
generally lasts from three to five years.
Canities
grey hair.
Scalp hair
grows faster on women than on men.
Integumentary system
hair, skin, nails, and glands are part of this system.
Pediculosis capitis
head lice.
Anagen phase
new hair is produced because new cells are actively manufactured in the hair follicle.
Dermal papilla
one of the main structures of the hair root that contains the blood and nerve supply that provides the nutrients needed for hair growth.
Asians
tend to have extremely straight hair.
Major elements
that make up human hair are carbon, oxygen, hydrogen, nitrogen, and sulfur.
Hair porosity
the ability of the hair to absorb moisture.
Healthy scalp
the average growth is ½ inch per month.
Sebum
the fatty or oily substance secreted by the sebaceous glands.
Catagen phase
the follicle canal shrink and detach from the dermal papilla.
Hair follicle
the tube-like depression or pocket on the skin or scalp that contains the hair root.
Mature strand
the two parts are hair roots and hair shaft of human hair.
Scutula
dry, sulfur-yellow, crusts on the scalp.
Hypertrichosis
a condition of abnormal growth of terminal hair in areas of the body that normally grow only vellus hair.
Scabies
a highly contagious skin disease caused by a parasite called a mite that burrows under the skin.
Hair follicles
are not found on the soles of the feet.
Salt bonds
account for about one third of the hair's overall strength.
By age 35
almost 40 percent of both men and women show some degree of hair loss.
Alopecia areata
an autoimmune disorder that causes the affected hair follicles to be mistakenly attacked by a person's own immune system.
Hypertrichosis
another name is hirsuties.
Bald men
are commonly perceived as less successful.
Monilethrix
beaded hair.
Dandruff
can easily be mistaken for dry scalp.
Normalizing shampoo
can treat oily hair and scalp by properly washing.
Tinea
characterized by itching, scales, and sometimes, painful circular lesions.
Medulla
composed of round cells.
Pityriasis
dandruff.
Scalp massage
does not increase hair growth.
Finasteride
is an oral prescription medication for hair loss that is meant for men only.
Hair
is approximately 90 percent protein.
Hair texture
is classified as coarse, medium, or fine.
Grey hair
is exactly the same as pigmented hair.
Fine hair
is more fragile than course or medium hair.
Hair growth
is not effected by shaving, clipping, and cutting the hair on the head.
Course hair
is stronger than fine hair.
Hair cuticle
is the outermost layer of the hair.
Trichorrhexis nodosa
knotted hair.
Vellus hair
lanugo hair.
Chemical services
performed on hair with low porosity required more alkaline solutions.
Pheomelanin
provides natural colors ranging from red and ginger to yellow and blond tones.
Tinea
ringworm.
Cross
sections- of hair can be almost any shape.
Catagen phase
signals the end of the growth phase.
Carbuncle
similar to a furuncle but is larger.
Helix
spiral shape of a coil pattern.
Medulla
the innermost layer of the hair and is composed of round cells.
Terminal hair
the long, course, pigmented hair found on the scalp, legs, arms, and bodies of male and females.
Hair bulb
the lowest part of a hair strand.
Hair density
the measurement of the number of individual hair strands on one square inch of the scalp.
Cortex
the middle layer of the hair.
Malassezia
the naturally occurring fungus that causes the symptoms of dandruff when it grows out of control.
Sebaceous glands
the oil glands in the skin that are connected to the hair follicles.
Hair root
the part of the hair located below the surface of the epidermis.
Trichology
the scientific study of hair, its diseases, and care.
Arrector pili muscle
the small, involuntary muscle in the base of the hair follicle.
Peptide bonds
the strong, chemical bonds that join amino acids.
Alopecia totalis
total scalp hair loss.
Vellus
type of hair that almost never has a medulla.
Minimize tangles
used a detangling rinse when shampooing extremely curly hair.
Whorl
when hair leaves the follicles at an angle and forms patterns or streams on the head.
Keratinization
when the living cells of hair form and begin their journey upward through the hair follicle, they mature in a process.
Wet hair
with normal elasticity will stretch up to 50 percent of its original length and return to that length without breaking.