Hair helps keep you warm. It also protects your eyes, ears and nose from small particles in the air. Common problem with the hair and scalp include hair loss, infections, and flaking.
Found exclusively in mammals, hair is one of the defining characteristics of the mammalian class.[1] Hair-like structures, called cilia, but which are not classified as hair, are visible in organs such as the nose and ear and these structures also occur in many other organs of mammals, other animals, and plants. Although non-mammals, especially insects, show filamentous outgrowths, these are not considered "hair" either, in the scientific sense. These so-called "hairs" (trichomes) also are found on plants. The projections on arthropods, such as insects and spiders, are classified as bristles, which are composed of a polysaccharide called chitin. There are varieties of cats, dogs, and mice bred to have little or no visible hair (fur). In some species, hair is absent at certain stages of life.
n the nearly 45 years since the original description of Menkes kinky hair disease (MKHD), advances in understanding the clinical, biochemical, and molecular aspects of this rare disorder of copper metabolism have outstripped progress in the design of effective therapies. The most promising therapy to date, very early subcutaneous copper injections, has normalized neurodevelopmental outcome in some individuals with Menkes kinky hair disease (approximately 30% in the author's experience) and mitigated the neurologic effects in others. However, some patients with Menkes kinky hair disease (nearly 50% in the author's experience) have not derived substantive benefit from this approach, despite very early institution of treatment.
