Skin Cancer :: essays research papers

Skin Cancer Cancer is a word used to describe a group of unhealthinesss. Each has its bear name, its own treatment, and its own chances of being cured. Each is different from the otherwises in many ways, but every basecer, whatever its called or whatever part of the body it is located in, is a disease of the bodys cells. The millions of picayune cells that make up the human body be so small that they can be seen only by flavour through a microscope. There are different kinds of cells, but they all make new cells by dividing into two. This is how worn-out, old cells are replaced with strong new ones. When a cell changes and doesnt do the job it should do for the body, it divides into more cells like itself, then these cells keep dividing into more cells. A group of these cells is a tumor. There are two kinds of tumors. A benign tumor is not cancer. The cells of a benign tumor can crowd out healthy cells, but they cannot spread to other move of the body. A malignant tumor is c ancer. Like a benign tumor, it can take over other healthy cells around it, but it can also spread to other parts of the body. To do this, a cell or group of cells from the tumor breaks away and moves, usually though the blood, to other parts of the body. There they divide and start tumors made of malignant cells like the ones that made up the first tumor. When this happens, it is called metastasis. Skin cancer is the most prevalent of all cancers, and its increasingly common. About a million Americans will develop skin cancer this year. It is a disease in which cancer cells are found in the outer layers of skin. Skin protects the body against heat, light, infection, and injury. It also stores water, fat, and vitamin D. The skin has two main layers and several kinds of cells. The top layer of skin is called the epidermis. It contains three kinds of cells flat, scaly cells on the fold up called squamous cells, round cells called basal cells, and cells called melanocytes, which give skin its color. The inner layer of skin is called the dermis. This layer is thicker, and contains blood vessels, nerves, and sweat glands. The hair on skin also grows from tiny pockets in the dermis, called follicles.