What is Hair? How Does Hair Grow?
What is hair?
According to the Webster's dictionary, hair
is any of the fine, threadlike outgrowths from the skin of an animal or
human being. Hair is composed of keratin, grows within the hair follicle
located under the scalp. Blood vessels surrounding the hair follicle provide the root with
nourishment.
How many hairs an average person has?
100,000 to 150,000.
What is hair follicle?
A hair follicle is a cavity of cells that forms a "bulb" around the base of the
hair in the scalp.
How does hair grow?
A healthy follicle produces a strong, thick, colored
hair at an average daily rate of approximately 0.35mm(1/72 inch), that
is, about 2.5cm(1 inch) every 21/2 months.
Hair growth follows a repeating, three-phase
cycle: the anagen (active), catagen
(intervening) and telogen (resting) phases.
How many hairs a person loses one day is
normal?
50 to 100.
|
