Hair - Other information

Hair is a filamentous outgrowth of the skin found only in mammals. In some species it is absent at certain stages of life. It projects from the epidermis, though it grows from follicles deep in the dermis. So-called "hairs" (trichomes) are also found on plants. The projections on insects and spiders are actually bristles. The hair of non-human species is commonly referred to as fur. There are varieties of cats, dogs, and mice bred to have little or no visible hair. Hair serves a number of different functions. It provides insula ...

Including:

• Hair - Human hair
• Hair - Structure
• Hair - Types of hair
• Hair - Hair change with aging
• Hair - Androgenic hair
• Hair - Other information

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Notable variations in physical appearance of the top and back of the head are: headgear hair color (original or artificial) hair type haircut, curls, dreadlocks, braids, ponytails, wigs, decorative hairpins, the way the hair is combed or otherwise arranged, or disarranged. Hair spray, gel, etc. may be used for fixation of the arrangement and may also make it shiny. It is commonly claimed that hair and nails will continue growing for several days after death. This is a myth; the appearance of growth is actually caused by the retraction of skin as the surrounding tissue dehydra ...

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Hair, Hair - Human hair, Hair - Structure, Hair - Types of hair, Hair - Hair change with aging, Hair - Androgenic hair, Hair - Other information

Read more here: » Hair: Encyclopedia II - Hair - Other information

Typically, humans have the longest hair on the top of the head, with shorter hair on the eyelids and eyebrows. Armpit hair and pubic hair serves as lubrication during rubbing. Sometimes, the term body hair is used, to distinguish it from hair on the head. 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 armp ...

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Hair, Hair - Human hair, Hair - Structure, Hair - Types of hair, Hair - Hair change with aging, Hair - Androgenic hair, Hair - Other information

Read more here: » Hair: Encyclopedia II - Hair - Human hair

Typically, humans have the longest hair on the top of the head, with shorter hair on the eyelids and eyebrows. The axillary (armpit) hair and pubic hair serves as lubrication during rubbing. Sometimes, the term body hair is used, to distinguish it from hair on the head. 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 ...

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Hair, Hair - Human hair, Hair - Structure, Hair - Types of hair, Hair - Hair change with aging, Hair - Androgenic hair, Hair - Other information

Read more here: » Hair: Encyclopedia II - Hair - Human hair

On most adult humans there are two main types of hair: terminal hair, and vellus hair. A third type, lanugo hair, is present in the fetus, and some newborn babies. It can also be seen on the bodies of those who are extremely thin. Terminal hair grows thick and long, and is what grows on the head, armpits and pubic area, as well as on the face, chest, arms and legs (better evident in men). Vellus hair is a very soft and short hair that grows most places in the body in both sexes. In Caucasians it is often colourless, or blonde. It is best seen in women and children, as they ...

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Hair, Hair - Human hair, Hair - Structure, Hair - Types of hair, Hair - Hair change with aging, Hair - Androgenic hair, Hair - Other information

Read more here: » Hair: Encyclopedia II - Hair - Types of hair

Older people tend to develop gray hair (actually colorless) because the pigmentation in the hair is lost and the hair becomes colorless. The age at which this occurs varies from person to person, but in general nearly everyone 75 years or older has gray hair, and in general men tend to become gray at younger ages than women. The older a person is, the more likely he or she is to have gray hair, and above 85 almost nobody has his or her original hair color. Gray hair is considered to be a characteristic of normal aging. People starting out with very pale blond hair usually deve ...

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Hair, Hair - Human hair, Hair - Structure, Hair - Types of hair, Hair - Hair change with aging, Hair - Androgenic hair, Hair - Other information

Read more here: » Hair: Encyclopedia II - Hair - Hair change with aging

Hair consists 90% of a biological polymer, α-keratin, and about 10% water, which modifies its mechanical properties. This α-helically coiled protein is further wound into supermolecular coiled-coil microfibrils, many of which are held together with a protein glue to form long macrofibrils, which are packed inside dead hair cells about 100 µm long by 3 µm across. Several of these associate to form one strand of hair, which is covered with tiny surface scales. The ends of individual keratin chains are high in the amino acids proline (an α ...

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Hair, Hair - Human hair, Hair - Structure, Hair - Types of hair, Hair - Hair change with aging, Hair - Androgenic hair, Hair - Other information

Read more here: » Hair: Encyclopedia II - Hair - Structure

On most adult humans there are two main types of hair: terminal hair, and vellus hair. A third type, lanugo hair, is present in the fetus, and some newborn babies. It can also be seen on the bodies of those who are extremely emaciated. Terminal hair grows thick and long, and is what grows on the head, armpits and pubic area, as well as on the face, chest, arms and legs (better evident in men). Vellus hair is a very soft and short hair that grows most places in the body in both sexes. In Caucasians it is often colourless, or blonde. It is best seen in women and children, as they ...

See also:

Hair, Hair - Human hair, Hair - Structure, Hair - Types of hair, Hair - Hair change with aging, Hair - Androgenic hair, Hair - Other information

Read more here: » Hair: Encyclopedia II - Hair - Types of hair

The hair follicles on much of the body respond to androgens (primarily testosterone and its derivatives). The rate of hair growth increases and the weight of the hairs increases. However, different areas respond with different sensitivities. As testosterone level increases (normally at puberty), the sequence of appearance of sexual (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. The following regions also respond to andro ...

See also:

Hair, Hair - Human hair, Hair - Structure, Hair - Types of hair, Hair - Hair change with aging, Hair - Androgenic hair, Hair - Other information

Read more here: » Hair: Encyclopedia II - Hair - Androgenic hair