Whilst dusting down in shower I got to thinking.
The hair on my head, it grows, its ready for cutting.
The hair on the rest of my body never needs cutting, why ?
Duh that's obvious. It can't get past your clothes
The rest of your body doesn't need to be as hot sa your head does and you lose something like 50% of your body heat through your head...
according to the wife ....shes a hairdresser, the hair on your body has a shorter life than the hair on your head jon
mark
Hair keeps growing, fur doesn't. 
Hair - on my head ???? 
quote:
Originally posted by Jon Ison
Whilst dusting down in shower I got to thinking.
The hair on my head, it grows, its ready for cutting.
The hair on the rest of my body never needs cutting, why ?
quote:
Originally posted by rusty nuts
quote:
Originally posted by Jon Ison
Whilst dusting down in shower I got to thinking.
The hair on my head, it grows, its ready for cutting.
The hair on the rest of my body never needs cutting, why ?
Just wait until you get older!
quote:
Originally posted by Jon Ison
The hair on the rest of my body never needs cutting, why ?
quote:
Originally posted by iank
Back, sack and crack wax
Have you got ginger hair with a name like rusty nuts then? Hehe, sorry couldn't resist! 
I wish!
As I get older the hair on my head has stopped growing, but it's sprouting out everywhere else!
I appreciate it's all in the genetic programming (the answer to your question), but what is it my body is anticipating that it feels compelled to
encourage the growth of hair in my lug-holes, nose, back, etc.?
Evolution is a funny old thing!
i always wondered this too!
quote:
Originally posted by scootz
I appreciate it's all in the genetic programming (the answer to your question), but what is it my body is anticipating that it feels compelled to encourage the growth of hair in my lug-holes, nose, back, etc.?
Funny how we all started off as apes, then evelved into humans and are now evolving back to apes again...?
Well.some poeple anyway.
For me the growth of my eyebrows is amazing now I'm getting a little older!
If I didn't trim I would be doing a Denis Healy impression now!
Each hair grows for a period of weeks or months(I seem to recall) then stops growing for a period (even longer if memory serves) then falls out. A
new one then grows in its place.
Hair on your head naturally grows longer than other hairs such as eye lashes or the tiny hairs on your hands. You don't let your head hair grow
to its full length, cutting it short every few weeks. It continues growing and so needs to be cut again before long. Face hair is the same. You
keep shaving it very short and a day or two later its grown back. In both those cases, if you never trimmed it, it would slowly grow to its full
length and then stop growing, just like other hairs.
thats quite interesting!
So if we cut some body hair that doesnt normally get cut the "regrowth" is all new hairs rather than the original stuff extending back to a
fixed length?
its defo the hair from the front of my head relocating to my ears and nose ..... was gutted last week i found my first grey chest hair
Dear Cecil:
I know that body hair only grows to a certain length and then stops. But how does hair know it's been cut? For instance, if I cut some arm or leg
hair off, how does it know this, and grow back? Do you understand?
— Mary B., Dallas
Dear Mary:
I am giving it my all, madam. Hair doesn't know it's been cut, and being dead tissue, doesn't much care. The fact is that body hair
will grow if you cut it, and it will grow if you don't cut it--it is, in short, always growing (or at least, at any given time, a substantial
portion of it is.) You just don't realize it, since in aggregate it never seems to get any longer. That's because the longest hairs fall
out, having been pushed out of their sockets by newer hairs working up from below.
The difference between body hair and scalp hair (and, in males, chin and mustache hair) is that the latter for practical purposes grows continuously,
whereas the former alternates regular periods of growth and dormancy. During the growth portion of the cycle, body hair follicles are long and
bulbous, and the hair advances outward at about a third of a millimeter per day.
After a few weeks growth stops, at which point, needless to say, the hair is as long as it is going to get. The follicle shrinks and the root of the
hair rigidifies. Following a period of dormancy, another growth cycle starts, and eventually a new hair pushes the old one out of the follicle from
beneath.
Naturally, the process doesn't occur simultaneously all over the body or you'd be shedding like a cocker spaniel. Whenever you happen to
shave your legs you'll be mowing some long, nongrowing hairs as well as some shorter, still-growing ones. And you'll miss some tiny new
hairs, which haven't yet protruded above the skin surface. The stubble you feel a day or two later is evidence that growth continues unimpeded.
OK, you say, but why does head hair grow to great length whereas body hair doesn't? Nobody knows exactly, but some anthropologists believe the
purpose of long head hair is to give you something to tie ribbons in. No kidding. Quoth one, "the functional significance of long head hair is
almost certainly adornment, providing for the 'sexual selection' that Darwin correctly argued was a potent factor in the evolutionary
process." In other words, when you drop sixty bucks at the beauty parlor, don't feel guilty--you're helping to advance the species.
— Cecil Adams