|MadSci Network: Anatomy|
If hair is dead cells, how does it know when to stop growing? For example, the hairs on my arm are about 1cm long. They've been 1cm long for several years. However, if I shave a few off, they'll grow back to about 1cm within the next few months. How does a hair folicle know how long it is, know when it's been cut, and know when to stop growing? I've also noticed that every so often, one single strand of hair on my arm will be 1-2 inches long and be completely out of place. Does a hair folicle sometimes make a mistake and grow too long? Thanks!
Re: How does arm hair know when to stop growing?
Try the links in the MadSci Library for more information on Anatomy.