Tuesday, September 27, 2011

Skin Cancer

There are two common forms of skin cancer which are: basal cell and squamous cell carcinomas. (carcinomas is a cancer arising in the epithelial tissue of the skin or of the lining of the internal organs.) Then, there are melanomas, which are the most advanced form of skin cancer, 65-90% of melanoma are caused by  UV( ultraviolent light) put off by the sun.
{There are three types of UV light: UVA, UVB, and UVC. UVA is the most common light on the earths surface and can reach past the human skin. It has been said the UVA damages the connective tissue in human skin and increases the risk of skin cancer. UVB rays are absorbed by the ozone layer which means that they arent as coomon on the earths surface, and they dont get into the skin like UVA but, they can still be damaging after time. And, UVC rays are very dangerous but they dont reach the earths surface.}
Skin cancer that forms in melanocytes (skin cells that make pigment) is called melanoma. Skin cancer that forms in the lower part of the epidermis (the outer layer of the skin) is called basal cell carcinoma. Skin cancer that forms in squamous cells (flat cells that form the surface of the skin) is called squamous cell carcinoma. Skin cancer that forms in neuroendocrine cells (cells that release hormones in response to signals from the nervous system) is called neuroendocrine carcinoma of the skin. Most skin cancers form in older people on parts of the body exposed to the sun or in people who have weakened immune systems.( info found fromhttp://www.cancer.gov/cancertopics/types/skin)

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