Cancer, Biology

What is Cancer?

Besides AIDS, Cancer is another deadly human disease of our times about which people are panicky all over the world. It is estimated that one in every three persons is a potential victim of cancer. Cancer is a disease resulting from an abnormal behaviour of cells in respected to their growth  and division during embryonic development, body growth, or regeneration and repair. Cellular growth and division occur under strict control of cellular genes. A cell which loses this control goes awry; It starts growing and dividing in an uncontrolled manner, forming an abnormal mass of similar cells in the concerned tissue.  This cell is a cancerous cell, and the mass of cells it gives rise to is called a tumour. This continues expanding and damaging neighbouring cells but, sooner or later. it generally becomes encapsulated in a fibrous capsule formed by the connective tissue around. Such     a localised tumour, called a benign tumor can be surgically removed .Thus unless a benign tumor becomes very large, it does not cause any significant discomfort to the patient.

If some cells  in an early tumor before encapsulation acquire further structural or functional abnormalities, these cells become invasive i e these break away  from the tumor, wander into the circulatory system and spread to distant sited in the body where these establish secondary tumours called metastases. The parent tumor is now called malignant. Such a tumor and its wandering cells are referred to as metastatic. The secondary tumors causes extensive damage to the tissues in   which these are formed, and this results into a full blown cancer causing death. A malignant tumor of connective tissue is called sarcoma.

Posted Date: 9/26/2012 6:20:31 AM | Location : United States







Related Discussions:- Cancer, Assignment Help, Ask Question on Cancer, Get Answer, Expert's Help, Cancer Discussions

Write discussion on Cancer
Your posts are moderated
Related Questions
Feeding management Feeding management deals about the in-house management in which the feed consumption pattern is well understood in the sheds and suitable alterations are made

Enzymatic analysis in foods: applications in food industry Did you know that the degree of bacterial contamination of foods or freshness of food, particularly, meat etc. can be

Simple interrupted technique of Suturing The simple loop is the most commonly used technique in dentistry and is routinely used to adapt tension free, mobile surgical flaps.

What is Cartilage explain briefly? Some bones, such as the bones in the skull, develop directly from membranous connective tissue, but in human fetal development, most of the s

Q. What do you understand by Haemagglutinins? Haemagglutinins are the globulin type of proteins which are present in the seeds of plants like double bean, field bean, white be

Q. What are the three phases into which the HIV infection is often divided? The HIV infection is frequently divided into three phases the acute phase, from the infection to 1 u

M e rc u r y The metal is biologically non-essential but being used in various industries, it is released in environment from both natural and anthropogenic sources. Man-m

Q. What are the lateral lines of fishes? The lateral lines of bony fishes are sense organs that extend along both sides of the animal body they make contact with the environmen

OTHE R GLANDS - (i) Mammary glands - Study of mammary gland is mastology. Modified sweat gland. 4-5 pairs in rabbit. 1 pair in human. In opposum 25 pairs (max.).

How to evaluate blanching efficiency? Finally, let us learn how to evaluate blanching efficiency? Normally, two of the more heat resistant plant enzymes, namely peroxidase and