How does hair growth rate vary over the body?

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Offline thedoc

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How does hair growth rate vary over the body?
« on: 16/01/2014 07:30:02 »
Mona Derise asked the Naked Scientists:
   
Kind of a silly question, but I recently completed chemotherapy and my hair is coming back.

It is just quite mind-boggling to me to observe the hair on different parts of my body grow back at very different rates.

The hair on my arms is shorter than the hair on my head, and the hair on my head is far longer than other "parts".

Why is this?

What determines hair growth rates? And what tells the hairs on our arms/legs to stop growing once it reaches a certain length while the hair on the head continues to grow continually?

Thanks!

What do you think?
« Last Edit: 16/01/2014 07:30:02 by _system »

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Offline RD

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Offline cheryl j

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Re: How does hair growth rate vary over the body?
« Reply #2 on: 16/01/2014 15:32:57 »
Scientists have shown that the rate of hair growth is inversely proportional to the unattractiveness of the haircut you just had.