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Article: HAIR
- Article from:
- Young Students Learning Library
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Human beings and all other mammals are the only animals that have hair.
These thin strands (shafts) that grow outward from the skin consist
of dead cells, similar to those in the fingernails. These dead cells
contain no nerves, so the cutting of the hair or nails is painless.
But the hair is rooted in a layer of the skin called the epidermis,
which contains many nerve endings. This is why it is painful when
your hair is pulled.
The root of each hair is located in a tiny sac called the hair follicle.
Tiny blood vessels, fat glands, and tiny muscles are connected to
each follicle. The blood vessels provide oxygen and nourishment to
the hair root. As new hair cells are ...