The Way Hair Grows
Q: Which way does hair grow? Does it grow from the scalp or from the end of the hair strand? I think that hair grows from the scalp, but my friends claim that it are the ends of the hair strands that gain length.A: Congratulations. You are the correct one in your peer group. The hair that we see emerging from the scalp is death tissue - specifically strands of protein chains that have hardened and are covered by a sheath of overlapping scales - also made of proteins.
And as an added tidbit that many people may not know. The cells of the hair that are formed in the papilla divide faster than any other cells in the human body - often doubling in number in 24-72 hours. This is the reason for the rapid rate of growth of the hair as opposed to other bodily tissues.
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See also:
What is hair made of and how does it grow?
The 3 hair growth stages
How fast does hair grow?
How can I improve my hair growth?