This is a presentation about hair, you can find some definition of hair, the hair cycle, and many other explanation about hair.

1. HOW
HAIR
GROWS ?

2. 1. What is Hair ?
2

3. The definiton of hair1
▹Hair is a protein filament that grows from
follicles found in the dermis, or skin.
▹Hair is one of the defining characteristics of
mammals. The human body, apart from areas
of glabrous skin, is covered in follicles which
produce thick terminal and fine vellus hair.
▹Hair is also an important biomaterial primarily
composed of protein, notably keratin.

4. The
Structure
OF HAIR
4

5. ”
▹ Hair grows out of little
pockets in your skin,
called follicles. Here's
how it happens :
5

6. Hair follows a specific growth cycle with
three distinct and concurrent phases6
Anagen
Catagen
Telogen

7. Anagen
▹Your hair begins growing
from a root in the bottom
of the follicle. The root is
made up of cells of protein.
▹Blood from the blood
vessels in your scalp
feeds the root, which
creates more cells and
makes the hair grow.
7

8. Catagen
▹The hair gets pushed up
through the skin as it grows,
passing an oil gland along the
way. The oil gland adds oil to
the hair and keeps it shiny and
soft.
8

9. Telogen9
▹The hair dies by the time it is
long enough to poke out
through the skin.

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