defination of Hair and its characteristics

hair

Hair is an outgrowth of protein, found only on mammals. It projects from the epidermis,though it grows from hair follicles deep in the dermis. The hair of non-human mammal species is commonly referred to as fur. There are varieties of cats, dogs, and mice bred to have little or no visible fur. In some species, hair is absent at certain stages of life. The main component of hair fiber is keratin. Keratins are proteins: long chains (polymers) of amino acids.

Types of hair

Normally Human beings have three different types of hair:

* Lanugo, the fine hair that covers nearly the entire body of fetuses.
* Vellus hair, the short, fine, "peach fuzz" body hair that grows in most places on the human body in both sexes.
* Terminal hair, the fully developed hair, which is generally longer, coarser, thicker, and darker than vellus hair.

Texture

Hair texture is described as fine, medium, coarse or wiry, depending on the hair diameter. Within the four texture ranges hair can also be thin, medium or thick density and it can be curly, straight, 'kinky' or wavy. Hair can be healthy, normal, oily, dry, damaged or a combination. Hair texture can also be affected by hair styling equipment such as straighteners, crimpers, or curlers. Also, a hairdresser can change hair texture with chemicals.

Hair is genetically programmed to be straight, curly, 'kinky' or wavy, and it can change from time to time.
The diameter of human hair ranges from 17 to 181 µm.

# Healthy hair indicates health and youth (important in evolutionary biology)
# Hair colour and texture can be a sign of ethnic ancestry
# Facial hair is a sign of puberty in men
# White hair is a sign of age, which can be concealed with hair dye

Comments

Post a Comment

Popular posts from this blog

Abdominal hair and its characteristics

Abdominal hair The abdominal hair refers to the hair that grows on the abdomen of humans in the region between the pubic area and the chest. The growth of abdominal hair follows the pattern of vertically from the pubic area upwards and from the thorax downwards to the navel. In men Before puberty, the abdominal region of both males and females is covered with very fine vellus hair. In response to rising levels of androgens during and after puberty, the skin of the abdomen begins to produce coarser, longer and more pigmented hair . This process affects primarily men. Initially hair grows in a vertical line from the pubic area up to the navel and from the chest down to the navel. Abdominal hair often indicates young teen men stepping into adulthood. In women Some women may develop a small line of hair from the pubic area up to the navel. many women consider it as unattractive. Excessive abdominal hair on women is called hirsutism. Patterns There are four general patterns of pubic and abd
Read more

List of Laser Hair Removal Centers in Washington

There are many laser hair removal centers in washington. The following are few addresses of laser hair removal centers. Some of them are pretty famous. 1). Federal Way Laser Surgeons Address : 34630 11th Avenue South Federal Way, Washington 98003 2). Advanced Laser & Beauty Center Address : 4800 Capitol Boulevard Southeast Number C Tumwater, Washington 98501 3). Advanced Laser Clinics Of Lynnwood Address : 18910 Alderwood Mll Pkwy Lynnwood, Washington 98036 4). Alderwood Laser & Electrolysis Address : 40 Lake Bellevue Drive Bellevue, Washington 98005 5). Clear Choice Laser Clinic Address : 1800 Cooper Point Road Southwest Olympia, Washington 98502 6). Little Mountain Laser LLC Address : 17879 Valley Ridge Ln Mount Vernon, Washington 98274 7). Northwest Lasercare Centers Address : 710 South 348th Street Suite A Federal Way, Washington 98003 8). Tacoma Laser Hair Removal Address : 1102 A St Tacoma, Washington 98402
Read more

Reasons or Causes for Grey Hair or White Hair

Hair is an important feature of a person. A beautiful hair would be an asset in the attractive frame to the face. Greying of hair is not an unusual thing to happen. It happens as the age increases. But the problem is Premature graying. One should take care of it in the initial stages itself. There are many reasons for premature greying in one person. The following are some of the reasons. Reasons for Premature Greying : * Excessive intake of alcohol, coffee and tea. * Sever illness and health problems like typhoid too can start greying of hair. * Excessive exposure to tension,stress and anxiety. * Premature greying of the hair can be hereditary. So it depends on the family background as well. * Excessive intake of oil and fried foods. * Deficiency of nutrients like copper can reduce the production of melanin. * Excessive intake of acidic and sour foods. * Excessive intake of spices.
Read more