Thursday, June 17, 2010

How fast does hair grow?

African American hair



How fast does hair grow?

An average of 6 inches per year.



How fast does hair grow?

it take a while to grow dna posture



How fast does hair grow?

It's different for everyone but you can take certain vitamins to help stimulate hair growth.



How fast does hair grow?

On the top of my head...doesnt grow fast enough...on the sides, it probably grows 1/8 inch every 2 weeks



How fast does hair grow?

Everybody is different and so is their hair so you cant really say! :]



How fast does hair grow?

Different parts of the human body feature different types of hair. From childhood onward, vellus hair covers the entire human body regardless of sex or race except in the following locations: the lips, the back of the ears, the nipples, the palms of hands, the soles of feet, certain external genital areas, the navel and scar tissue. The density of the hairs (in hair follicles per square centimeter) varies from one person to another.



The rising level of male hormones (androgens) during puberty causes a transformation process of vellus hair into terminal hair on several parts of the male body. The hair follicles respond to androgens, primarily testosterone and its derivatives; the hair in these locations can be thus termed androgenic hair. The rate of hair growth and the weight of the hairs increase. However, different areas respond with different sensitivities. As testosterone level increases, the sequence of appearance of androgenic hair reflects the gradations of androgen sensitivity. The pubic area is most sensitive, and heavier hair usually grows there first in response to androgens.



Layers of an individual hair



Areas on the human body that develop terminal hair growth due to rising androgens in both sexes, men and women, are the underarms and the pubic area. In contrast, normally only men grow androgenic hair in other areas. There is a sexual dimorphism in the amount and distribution of androgenic hair, with males having more terminal hair (particularly facial hair, chest hair, abdominal hair and hair on legs and arms) and females having more vellus hair, which is less visible. The genetic disposition determines the sex-dependent and individual rising of androgens and therefore the development of androgenic hair.



Increased body hair on women following the male pattern can be referred to as hirsutism. An excessive and abnormal hair growth on the body of males and females is defined as hypertrichosis. Considering an individual occurrence of body hair as abnormal does not implicitly depend on medical indications but also on cultural and social attitudes.



Individual hairs alternate periods of growth and dormancy. During the growth portion of the cycle, hair follicles are long and bulbous, and the hair advances outward at about a third of a millimeter per day. After three to six months, body hair growth stops (the pubic and armpit areas having the longest growth period). The follicle shrinks and the root of the hair grows rigid. Following a period of dormancy, another growth cycle starts, and eventually a new hair pushes the old one out of the follicle from beneath. Head hair, by comparison, grows for a long duration and to a great length before being shed. The rate of growth is approximately 15 millimeters, or about 閳?inch, per month.



How fast does hair grow?

On average, hair grows about 1/2 inch a month. If you're trying to grow your hair out, that seems so slow. If you hate to touch up your roots, it's way too fast!



How fast does hair grow?

I am black and mines never grows past a certain length. get a sew in weave.(like me)

No comments:

Post a Comment

 
school loans