Hair is protein filament that grows through the epidermis from follicles deep within the dermis. Found exclusively in mammals, it is individually of the defining characteristic of the mammalian class. Although manifold other organisms, especially insects, show filamentous outgrowths, these are not considered "hair" in the scientific sense. So-called "hairs" (trichomes) are also found on plants. The projections on arthropods such as insects and spiders are actually insect bristles, composed of a polysaccharide called chitin. The hair of non-human mammal species is commonly referred to as fur. There are varieties of cats, dogs, and mice genteel to have cramped or no visible fur. In some species, hair is attendant at sanguine stages of life. The main component of hair fiber is keratin. Keratins are proteins: deep chains (polymers) of amino acids.
-
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 Hair Extensions thick density and it can be straight, curly, 'kinky' (tightly coiled), or wavy
- Hair conditioner also affects hair texture
- 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 advance hair texture with chemicals.