Why does hair taken from a donor site continue to grow when transplanted into a bald scalp?
Every hair on your body has its own distinctive and inherited life cycle and these characteristics are not altered by transplantation to new sites. Some hairs are predetermined to fall out prematurely while in other regions the follicles produce hairs of a more permanent variety. Hair follicles at the back of the head are not sensitive to the effects of dihydrotestosterone, which is why they continue to grow strongly.