Excess hair growth hirsutism

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Hair serves a number of different functions. It provides insulation from cold weather and, in some species, from particularly hot weather. Because hair is often pigmented, it provides coloration. This might serve to camouflage an individual; in some mammals, the pigmentation changes with the seasons, becoming white during the snowy winter, for example.

The cuticle is responsible for much of the mechanical strength of the hair fibre. It consists of scale-shaped layers. Human hair typically has 6-8 layers of cuticle. Wool has only one, and other animal hair may have many more layers. Hair responds to its environment, and to its mechanical and chemical history. For example, hair which is wetted, styled and then dried, acquires a temporary 'set', which can hold it in style. This style is lost when the hair gets wet again. For more permanent styling, chemical treatments (perms) break and re-form the disulphide links within the hair structure.

The speed of growth is roughly 10 cm/yr = 0.3 mm/day = 3 nm/s. The cells at the base of the hair follicle divide and grow extremely rapidly. This is why people under chemotherapy sometimes lose their hair; the treatment targets any rapidly-dividing cell, not just the cancerous ones.

Norris Hair Transplant Clinic
About the Clinic, services and procedures and contact information. Includes information on hair growth type products. Located in Knoxville.
Lucia
Manufactures hair, eyebrow and eyelashes growth products made of natural Japanese ingredients. Based in Nagoya. Site in English, Japanese, and Korean.
LazrSmooth Studios
Services include hair removal, human growth hormone replacement therapy, facial contouring therapy, chemical peels, and European shaving technique and accessories.
MoreHair.com
Comprehensive, up-to-date information about hair growth, hair loss, and various treatment options. Factual articles on the follicle, the growth cycle, and genetics.
Unbalding: Hair Today, More Tomorrow?
by Susan L. Narod. Hair growth products overview, causes of hair loss, hair transplant surgery.

Excess hair growth hirsutism