(Gaffin, p.152)." Apoptosis is a type of cell death that is a normal part of development.

Cancer happens when cells begin to divide more rapidly than the cell from which they

came from, and continue doing so. The cells are able to grow due to mitosis, which is a

form of cell division that enables an organism to grow by adding cells.

A cancerous cell obtains oxygen and nutrients from surrounding blood vessels by

diffusion across its membrane, in the same way as normal cells. As the tumor enlarges, its

inner cells are starved of nutrients. Enlarging tumors use two methods of acquiring

nutrients, by invading existing blood vessels and by angiogenesis. Angiogenesis is the

process by which a tumor stimulates new blood vessels to form. Cancer induced

angiogenesis builds the cancer cells own blood supply.

Since proteins control the cell cycle, and genes encode proteins, genes play a major

role in causing cancer. There are two major classes of genes that contribute to causing

cancer; the oncogenes and the tumor suppressor genes.

Oncogenes are versions of genes that normally trigger cell division, but they are

more fluid. Tumors form because of the lack of contact inhibition. Cancer cells often

Given sufficient nutrients and space, cancer cells can divide uncontrollably and

through the arteries (www. pg. 2)."

smoking, and many more carcinogens. A carcinogen is anything thought to be cancer

protein products normally prevent a cell from dividing or promote normal cell death.

starts by the cells breaking of the main tumor; from there they begin to travel through the

because their cells have had more time to accumulate genetic damage, the bodies immune

throughout our research you can easily see how powerful cancer really is, by their

Some common words found in the essay are:
, cancer cells, tumor suppressor, cell division, cell cycle, tumor suppressor gene, blood vessels, suppressor gene, local invasion, healthy tissue, cancer cell, cancer spreads, tumor suppressor genes, own blood supply, oncogenes tumor suppressor, prevent cell dividing,
Approximate Word count = 1190
Approximate Pages = 5 (250 words per page double spaced)