Hair growth, About Hair, Hair Cycle

HOW HAIR GROWS ?

1. What is Hair ?

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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.

The StructureOF HAIR

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▹ Hair grows out of little pockets in your skin,

called follicles. Here's how it happens :

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Hair follows a specific growth cycle with three distinct and concurrent phases6

Anagen

Catagen

Telogen

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. 

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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.

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Telogen9

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

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