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Why Does Hair Only Grow to a Certain Length?

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 Biology   |   Health   |   Science
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I very briefly mentioned this in an article about two years ago that you might also be interested in (There is No Difference Between Fur and Hair), but I’ll go into more detail here. Hair length is completely controlled by the length of the anagen phase of your hair follicle. How long this period lasts is generally determined mostly by genetics, but can also be affected by hormones, and even extreme stress. More specifically, there is a chemical signal that ultimately controls the exact growth cycle.

Want the text version?: http://www.todayifoundout.com/index.php/2012/05/why-does-hair-only-grow-to-a-certain-length/

Sources:

http://www.todayifoundout.com/index.php/2010/02/there-is-no-difference-between-fur-and-hair/
http://www.hairfactz.com/
http://tlc.howstuffworks.com/style/question100.htm
http://dermatology.about.com/od/hairanatomy/l/bldefanagen.htm
http://dermatology.about.com/library/bldefcatagen.htm
http://en.wikipedia.org/wiki/Hair_follicle
http://en.wikipedia.org/wiki/Epidermal_growth_factor

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