How come the hair on our heads can grow long but the ones on our arms only grow to a certain length then stop?

Question

My hairdresser never has to "take a little off the sides" on my arms...

Answer 1

Hormones and receptors. Yes, there is a genetic component, but there is expression of genes also. Your body releases hormones which tell hair to grow (growth hormone, thyroid hormone, androgens). There are two different types of hair on your body - vellus hairs which are short, fine and colorless and terminal hairs which are long, coarse, colored and, in certain areas of the body, responsive to hormonal influence (androgens).

When you are a baby, you are bald. This is before the body starts producing significant amounts of androgens. The baby might be covered with a soft, fine down on arms and legs that disappears later. Once androgen production kicks in around age 2 (and gender-based personality differences begin to emerge), hair begins to grow on the head, due to specialized scalp cells responding. After puberty, boys also grow hair on their faces and in other places due to increased production of androgens.

Women don't produce significant amounts of these androgens, so you don't see facial hair on women unless they are producing abnormal amounts of these hormones. (This happens to some women during menopause.)

Answer 2

Why is it that the skin on your nose is not exactly like the skin on your cheeks? Why is it that the muscles on your back don't bulk up like the bicepts or thighs? Why is it that your tongue has hair and the gums don't? Why is it that your eyebrows are not like your pubic hair? Why is it that the skin on the eyelids are not like the soles of your feet?

There are specialized parts and the code for them all is in the DNA of everycell. As babies in the womb our tissues differentiate and just as all limbs are not the same (as in you don't have legs and feet growing out of your shoulders or noses above your rear) not all hair is the same. An african male lion has a mane that is not uniform all the way to his hips and you have different hair under your arms as on your arms as over your eyes as atop your head as atop your toes or growing around your rear as between your legs--it is all differentiated tissues (the follicles for hair) that began before you were born.

Answer 3

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Answer 4

I think it is one of those things that are imprinted on our cells. Every part of our bodies have their own cells like skin cells which are programmed to do specific things like grow hair on your head longer than the skin cells on your arms will grow hair

Answer 5

i dont no but well would you realy want your arm hair to be as long as the hair on your head i certainly wouldnt but that might just be me as my hair is very and goes down tomy bum

Answer 6

Because then we wouldn't have to wear long sleeves in the winter.

Answer 7

Because God knew what he was doing.

Answer 8

genetics