News tagged with hair

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Detecting hearing loss, vertigo via blood tests

There are more than 30 blood tests in clinical practice today to confirm disease. For heart attacks, cardiologists test the blood for cardiac enzymes; for osteoporosis, proteins in the blood can signal thinning bones.

Aug 18, 2016
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Red hair gene variation drives up skin cancer mutations

For the first time, researchers at the Wellcome Trust Sanger Institute and University of Leeds have proved that gene variants associated with red hair, pale skin and freckles are linked to a higher number of genetic mutations ...

Jul 12, 2016
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Researchers pluck hair to grow hair

If there's a cure for male pattern baldness, it might hurt a little. A team led by USC Stem Cell Principal Investigator Cheng-Ming Chuong has demonstrated that by plucking 200 hairs in a specific pattern and density, they ...

Apr 09, 2015
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Hair

Hair is a protein filament that grows through the epidermis from follicles deep within the dermis. The fine, soft hair found on many nonhuman mammals is typically called fur; wool is the characteristically curly hair found on sheep and goats. Found exclusively in mammals, hair is one of the defining characteristics of the mammalian class. Although other non-mammals, 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. 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.

The hair can be divided into three parts length-wise, (1) the bulb, a swelling at the base which originates from the dermis, (2) the root, which is the hair lying beneath the skin surface, and (3) the shaft, which is the hair above the skin surface. In cross-section, there are also three parts, (1) the medulla, an area in the core which contains loose cells and airspaces (2) the cortex, which contains densely packed keratin and (3) the cuticle, which is a single layer of cells arranged like roof shingles.

This text uses material from Wikipedia, licensed under CC BY-SA

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