hair follicle structure

Each hair grows from a hair follicle. The follicle not sit at the top of the skin. The follicle is in a sebaceous gland, a small indentation in the skin. The process of hair growth begins in the follicle.The human body contains two types of hair. Most of the body is covered with Vellus hairs. The scalp and both contain eyebrow hairs. This article describes the process of hair growth in hair terminal.

During a human the first year of life, all of the terminal hairs on her head grows unabated. After a child becomes a child after different terminal hairs grow at different rates. Each hair on the head of the child has a different growing season. Hair growth requires production of new cells. New hair cells are produced in the bottom of the bulb of the hair. The hair bulb is the portion of hair that falls within the hair follicle. While in the follicle, is nourished by the blood flowing in the skin, skin that cradles the hair bulb.

As new hair cells, which push the old cells, the cells attached to the hair bulb. Pushed by new cells, the hair cells move higher up the hair bulb. Finally, the hair cells get pushed to the top of the bulb of the hair. At that time undergo a major change.
When the hair cells reach the top of the bulb of the hair, they begin to form layers of 6 cylinders. The cells in the inner layer will harden, but that contain the protein called keratin. The hardened cells in the inner layer are seen as a chapter of a human hair.
The rate at which new cells in the form of hair bulb plays an important part in determining the speed at which any hair grow. The formation of new hair cells requires the division of precursor cells. As always happens in cell growth, division carried out more quickly if the cells are well nourished. That is why thinning hair can be prevented with proper diet.
Hair growth also includes the production of keratin. Since the keratin is a protein, its production is genetically controlled. This helps explain why some people have hair growing faster than others.Hair growth, like many aspects of life, demonstrates both the effect of environment and genetic component of the living cell.