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

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