If you shave them they only grow back to the original length.How does it know?
2006-06-21 12:24:26 · 8 answers · asked by karlos 2 in Science & Mathematics ➔ Biology
NOT ONE OF THE ABOVE ANSWERS IS RIGHT!!!
The way it works is very very simple.
A hair follicle has a cycle, growing the hair for a fixed period of time, then releasing the hair, and entering a temporary dormant state, until it grows another one.
This is why you are always losing hair - a number of hairs are released (dropped, or fall out) every day as the follicle enters a restitive state.
It also explains why eyebrows aren't as long as the hair on your head or that under your armpits. The follicles cycle is shorter, growing a hair-shaft for only about three months before releasing it.
In the case of follicles on the head, the cycle can be several years, and combined with hair growth rates of around 15 inches per year, allows some people to grow their hair to 5 feet or more - something that could NEVER happen to eyebrows!
TO THE REST OF YOU ABOVE. PLEASE DON'T GUESS AT QUESTIONS IF YOU REALLY DON'T KNOW THE ANSWER. YOU ARE MISLEADING PEOPLE AND WASTING EVERYBODIES TIME JUST SO YOU CAN GET A POXY TWO CREDIT POINTS.
2006-06-23 05:11:13 · answer #1 · answered by Anonymous · 6⤊ 1⤋
There are some hormones that regulate where you grow hair, how much and how long.
After growing to the specific length, the hair stops growing, stays there for a few weeks, falls off and after a while is replaced by another one.
2006-06-21 13:08:22 · answer #2 · answered by todaywiserthanyesterday 4 · 0⤊ 0⤋
The reason is because that is how long your hair lasts. Hair is different on every part of the body. How long it gets is dependent on how much the end of that hair can withstand. The tip of the hair is always wearing out, but the hair itself does not stop growing.
2006-06-21 12:30:32 · answer #3 · answered by Brandi A 2 · 0⤊ 0⤋
I think that this one of those genetic Vs environmental dealies. I disagree with the clothes thing 'cos... let's just say I disagree. Asians tend to be hairier due to the heat of their native habitat (the hair regulates temperature). I haven't seen this in Africans though, so I'm open to new ideas. It may be something to do with evolution and natural selection - it could be a remnant of our hunter-gatherer days.
2006-06-22 04:47:40 · answer #4 · answered by hasina_ghani 3 · 0⤊ 0⤋
Hair is natural cover to skin.It protects skin from heat,cold etc.It doesnot require to be lengthy.So its length is limited to the minimum required.If evolution theory is correct man should become copletely hair less after thousands of years.
2006-06-21 18:21:10 · answer #5 · answered by leowin1948 7 · 0⤊ 0⤋
no because arm and leg hair you does no longer ought to wax or per chance u did yet no longer that typically to it does no longer improve lengthy like the pinnacle or facial hair beside ur hair and the faical hair u ought to shrink all and distinctive or each and every 2 weeks
2016-10-20 11:52:56 · answer #6 · answered by arrocha 4 · 0⤊ 0⤋
As you get older the hairs will grow longer.
2006-06-21 12:27:50 · answer #7 · answered by Norman Bates 4 · 0⤊ 0⤋
be cause they are alway's being rubbed by clothe's
2006-06-21 12:29:02 · answer #8 · answered by Anonymous · 0⤊ 0⤋