The discussion revolves around the causes of gray hair and the biological processes associated with aging. Participants explore the relationship between chemical changes in the body, particularly the role of melanin and melanocytes, in the graying of hair.
Participants express varying views on the relationship between aging and the graying of hair, with some suggesting a direct connection to age while others argue that the process may not be strictly age-related. The discussion remains unresolved regarding the exact mechanisms and factors involved.
There are limitations in the discussion regarding the assumptions about the relationship between catalase, heme-Fe, and the aging process, as well as the specific roles of melanocytes and melanin in hair pigmentation.
The chemical is melanin.oracle21 said:As we age their is less of the chemical that keeps the hair dark!
We need to find out this chemical!
What causes your hair's color to change? That has to do with the process controlling the production of the pigment called melanin, the same pigment that tans your skin in response to sunlight.
Every hair follicle contains pigment cells called melanocytes. The melanocytes produce eumelanin, which is black or dark brown, and pheomelanin, which is reddish-yellow, and pass the melanin to the cells which produce keratin, the chief protein in hair. When the keratin-producing cells (keratinocytes) die, they retain the coloring from the melanin. When you first start to go gray, the melanocytes are still present, but they become less active. Less pigment is deposited into the hair so it appears lighter. As graying progresses, the melanocytes die off until there aren't any cells left to produce the color.