Hair is consist of two parts, the Follicle and the Shaft.
Follicle - The follicle contains several layers, and each layer serve a different job. At the base of the follicle is a projection which is called a papilla. papilla contains capillaries, or tiny blood vessels, these vessels feed the cells. The living part of the hair is bottom part that surrounds the papilla or bulb. The cells

The follicle is further in between two sheaths - inner and outer. The inner follows the hair shaft and ends just before opening of skin. While the outer sheath goes all the way to gland. The sebaceous gland is very important because it produces materials that provides natural conditioner to your hair.
Shaft - This is the dead part of hair. It is made up of hard protein called keratin and it consist of three layers. The inner is medulla and is not present in the hair shaft most of the time. Next comes cortex and then cuticle. It is the cortex that makes up the majority of hair. The cuticle is formed with tightly packed scales. This is where your hair conditioner acts. And from where the color of hair comes from? these are pigment cells that are distributed in the cortex
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