Ask a Teacher

Search



1.why our hair is black colour ,and as we grow older why does it changes to white colour? 2.why is Indians hair colour different from USA?

Two to three layers of specialized cells make up each hair strand. Although the two outer layers are present in every strand of hair, the inner layer, or medulla, is only present in coarse hair. The extreme outer layer, the cuticle, protects the hair's vital structures housed in the cortex or middle layer. It is here, the cortex, where melanin can be found. Without melanin, hair would be colorless or white since the remaining cells and structures are transparent.Pigmentation occurs when pigment cells, located in the hair follicle, produce melanin. The color produced depends on the number of melanin cells produced as well as the size of the cells. Darker hair possesses larger, more numerous cells. Lighter hair possesses small cells in fewer numbers.Pigment cells, melanocytes, stop producing melanin with age and hence hair tuns white due to age.
May be because of the low amount of melanin present.



comments powered by Disqus