whats a tumor?

Question:

details plz

Answers:
Tumor (American English) or tumour (British English) originally means "swelling", and is sometimes still used with that meaning. Tumor meaning swelling is one of the five classical characteristics of inflammation. However, the term is now primarily used to denote abnormal growth of tissue. This growth can be either malignant or benign. It is similar in meaning to a neoplasia.

Tumor Types: Malignant vs. benign
Malignant tumors are called cancer. Cancer has the potential to invade and destroy neighboring tissues and create metastases. Benign tumors do not invade neighboring tissues and do not seed metastases, but may locally grow to great size. They usually do not return after surgical removal.

An epithelial tumor is considered malignant if it penetrates the basal lamina and is considered benign if it does not.

As people get older, they accumulate more mutations in their DNA. This means that the prevalence of tumors increases strongly with increasing age. It is also the case that the older a person with a tumor is, the higher the chances are that the tumor is malignant. For example, if a woman of 20 years old has a tumor in her breast it is very likely that the tumor is benign. However, if a woman of 70 has a tumor in her breast it is almost certain that it is malignant.

Anaplasia is a term that refers to the histologic grade of a tumor. Anaplastic tumors are poorly differentiated, meaning that their cells look primitive and do not resemble normal cells. Having anaplasia in a tumor usually means that the tumor is malignant, although a malignant tumor need not be anaplastic.

Causes
Tumors are caused by mutations in DNA of cells. An accumulation of mutations is needed for a tumor to emerge. Mutations that activate oncogenes or repress tumor supressor genes can eventually lead to tumors. Cells have mechanisms that repair DNA and other mechanisms that cause the cell to destroy itself by apoptosis if DNA damage gets too severe. Mutations that repress the genes for these mechanisms can also eventually lead to cancer. A mutation in one oncogen or one tumor repressor gene is usually not enough for a tumor to occur. A combination of a number of mutations is necessary.

DNA microarrays can be used to determine if the expression of oncogenes or tumor repressor genes has been altered. Possibly in the future tumors can be treated better by using DNA microarrays to determine the exact characteristics of the tumor

Other Answers:
It is an exponential growth of cells.

abnormal growth of cells

An abnormal growth of tissue resulting from uncontrolled, progressive multiplication of cells and serving no physiological function; a neoplasm.
Source(s):
The American Heritage Dictionary

an abnormal huge bubble in your body that can explode

Tumor also known as swelling and it's one classification of inflammation. the word tumor is used referring to the abnormal growth of tissues which could possibly turn out to be malignant or benign.
Source(s):
my lil brain

a tumor is a bunch of cells that have been mutated. which can either be malignant or Benign milignant tumors are a fancy word for cancerous and Benign tumors don't destroy neighboring tissues and usually don't come back after surgery.
Source(s):
My brain!

An abnormal growth of tissue resulting from uncontrolled, progressive multiplication of cells and serving no physiological function. Check out the web site below also.
Source(s):
http://www.bioscience.org/atlases/tumpath/

Its a cancer better known as Brenda (Loy) Burran.. It forms in your life and her/its very presents makes you sick. It needs to be burned, froze or nuked..

Hey don't you hate retards that cut and paste their answers? I know I do. Tumors are anomalous growths of cells that can form from the result of genetic disease, cancer, the result of some stimulus (physical or chemical, or spontaneously in otherwise healthy individuals. Cancerous are called malignant. Harmless tumors are called benign.
Hows that?

tu·mor (tmr, ty-)

NOUN:

An abnormal growth of tissue resulting from uncontrolled, progressive multiplication of cells and serving no physiological function; a neoplasm.
A swollen part; a swelling.

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ETYMOLOGY:
Middle English tumour, from Latin tumor, from tumre, to swell; see teu- in Indo-European roots
Source(s):
http://education.yahoo.com/reference/dictionary/entry/tumor

Why, do you feel a swelling?

i dont care you dumb **** you have n othing else to do and nobaody likes u so go f**k your self

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whats a tumor?

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