Causes of cancer, Biology

Causes of Cancer

We know earlier that a malignant tumor is a large aggregation of cancer cells, all of them descended from a single founder cell that was once a normal cell with normal functions in a particular tissue. What happens to the cell to free it from the general constraints on cellular growth? We can examine the cause of cancer mostly at two levels:

(1) The change that converts a normal cell to a cancer cell.  

(2) The agents that trigger the change from normal to cancerous stage and

These are called carcinogens. For instance X-rays and ultraviolet rays in sunlight are both physical agents which cause cancer. Exposure to X-rays is a important cause of leukemia and brain cancer, whereas UV is known to cause skin cancer including the deadly type-melanoma. Similarly several chemicals are known carcinogens. For example tobacco is one of the most common agents related to cancer of the oral cavity. We also learnt that certain viruses can cause cancers in animals like cats, laboratory mice, birds and frogs, certain viruses have also been relates with human cancers. In all these cases we should realize that some change occurs at the level of genes that can be passed on at each mitosis, so giving a clone of cancer cells.

Posted Date: 1/31/2013 7:47:19 AM | Location : United States







Related Discussions:- Causes of cancer, Assignment Help, Ask Question on Causes of cancer, Get Answer, Expert's Help, Causes of cancer Discussions

Write discussion on Causes of cancer
Your posts are moderated
Related Questions
Nitrogen is very important constituents of all organisms life  because it forms the structural parth of proteins, nucleic acids and chlorophyll molecules.               Earth 's

What are the principal sources of excessive nitrate and phosphate in rivers and lakes?

Q. Does the DNA replication occur in the cell division? Yes. The DNA replication occurs in mitosis as well in the meiosis.

Autotrophic and Heterotrophic Succession The succession where initially the green plants are much greater in quantity than the animals, is known as autotrophic succession. Su

DEVELOPMENTAL DISORDERS - 1 .      AMNIONITIS- Inflammation of amnion due to infection. 2 .      ABORTION- Escape of a embryo prior to the stage of viability (ab

State the Definition of Temperature Temperature may be defined as degree or amount of body heat.  It is the balance between heat produced and heat lost by the body.  It is meas

Q. Nutrition Support for myocardial infarction patient? The nutrient requirements of a MI patient vary from time of getting hospitalized in an emergency to the time of getting

In what two ways will the composition of blood coming from the pulmonary artery vary from that going to the pulmonary vein? Blood in the pulmonary artery will have less oxygen

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Which of the following contributes to the degeneracy of the genetic code? A. The presence of 64 codons but only 20 amino acids. B. The ability of a single tRNA to bind to ma