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 thi