WHAT IS CANCER?-LESSON 90
In the coming lessons we will learn about cancer. WHAT DOES CANCER MEAN? Every single livelihood for instance microorganisms, creepy-crawly insects, animals, and human beings are constructed of abundant cells. Human body itself is constructed of millions of cells that are particularly modified to accomplish specific roles for example sex cells, sperms, and egg (these cells perform the role of reproduction). What is a cell?
The cell is the basic unit of all living things or organisms, which can duplicate itself exactly. A tissues is a gathering or one type of cells of same kind for instance nervous tissue, muscular tissue, connective tissue, etc, A collection of same kind of tissues form an organ, such a heart, lungs, liver, etc. In other words, an organ is a part of the body, composed of more than one tissue.
As the human body grows from babyhood to parenthood, the cells belonging to different tissues and organs break up and subdivide in anticipation of more increase of the cells is required with the exception of the normal metabolism of the body. Usually the speed at which an organ should grow and when it should stop growing is controlled by the body itself only.
Cancer originates from the anomalous and uncontrolled division of cells, known as cancer cells, that then invade and destroy the surrounding tissues. Cancer cells, in other words, refuse to stop multiplying and continue to increase in number. It is the failure to stop multiplying which is the hallmark of cancer. This they do even at the cost of other normal cells of the body which are starved to death for lack of nutrition.
Cancer cells are different from normal cells in some aspects. They do not remain confined to one part of the body. They penetrate and infiltrate into the adjoining tissues and dislocate their function. Some of the cancer cells get detached from the main mass or site of origin and travel by blood and lymph channels to sites distant from the original tumor and form flesh colonies, known as metastasis or secondary growths, in other organs where grow at the cost of the normal cells. This is how they destroy the well-regulated functioning of the body and bring about its end.
A cancer may be slow-growing or fast-growing. The rate at which a cancer grows depends on the tissue in which it occurs and also on the inherent character of the type of cancer. Rapidly-growing cancers are those which send metastasis in other organs, are much more dangerous. Sometimes, the primary cancer in first stage of development grows slowly, as for example, that of the stomach and remains unnoticed, while the secondaries spread rapidly in the liver, abdominal lymph glands etc. These secondary cancers are first noticed.
In the next lesson we will learn about Mesothelioma. Okay.
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