Quiz 2 Flashcards
Hair is primarily composed of?
Proteins (80%)
They are hard fibrous proteins
Keratin
Keratin protein is comprised of what we call as
polypeptide chains
They are produced inside the hair follicle and packed into granules found in the fibers.
Melanin
The dominant pigment in brown hair, and black hair
Eumelanin
the dominant pigment in red and blonde hair
Phenomelanin
Average total number of scalp hairs is
Average rate of growth is
100,000
0.35 mm/day
Hair grows faster in summer than in winter. T/F
True
Average daily loss is 25-100 hairs/day. Fastest growth is between 20-30 years old.
Male hair grows faster than female hair. T/F
True
False (15-30)
False (Female grows faster)
long, thick, pigmented hair
found on scalp, legs, arms and
body
Terminal hair
short, fine, down, unpigmented hair on body
Vellus (Lanugo) hair
It determines the shape of the hair
Hair Shaft
If the shaft is round, the hair is ______
If the shaft is oval, the hair is _______
If the shaft is flat, the hair is _____ or _____
Straight
Wavy
Curly or Kinky
What are the most dominant and rarest hair color
Black - Most
Red - Rare
She has the longest hair on record
Asha Mandela
A flexible thin keratin thread with great
strength and elasticity. It is present on almost all surfaces of the human skin.
Hair
Parts of the body where hair does not grow
Palms
Soles
Vermillion zone of lips
Parts of genitals
The outermost layer of the hair. It consists of a single layer of transparent, scale like cells that overlap like shingles on a roof
Cuticle
- The middle layer of hair; a fibrous protein core formed by elongated cells containing melanin pigment. About 90 percent of hair weight comes from this.
Cortex
Innermost layer; also referred to as the
pith (Core) of the hair. It is composed of
round cells
Medulla
Very fine and naturally blonde
hair may not even have a medulla. T/F
True
Growth period is 2-5 years before replacement
Active-Growth Phase (Anagen)
Lasts one to two weeks and hair follicle shrinks about 80%.
Transition Phase (Catagen)
After five or six weeks, dermal papilla reconnects to base of hair follicle and bloodstream. The hair re-enters the active-growth phase and a new hair begins to from.
Resting Phase (Telogen)
