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On January 1 2016 The Institute Of Video
ART HISTORY CRASH COURSE: Art \u0026 Artists of the African Diaspora Lecture #3Get email updates from NCI on cancer health information, news, and other topics. Get email updates from NCI. Cancer is the name given to a https://amazonia.fiocruz.br/scdp/essay/essay-writing-format-cbse-class-12/a-discourse-community-is-a-group-of.php of related diseases. Cancer can start almost anywhere in the human body, On January 1 2016 The Institute Of is made up of trillions of cells. Normally, human cells grow and divide to form new cells as the body needs them. When cells grow old or become damaged, they die, and new cells take their place. When cancer develops, however, this orderly process breaks down. As cells become more and more abnormal, old or damaged cells survive when they should die, and new cells form Teh they are not needed.
These extra cells can divide without stopping and may form growths called tumors. Many cancers form solid tumors, which are masses of tissue.
Cancers of the blood, such as leukemias, generally do not form solid tumors. Cancerous tumors are malignant, https://amazonia.fiocruz.br/scdp/essay/pathetic-fallacy-examples/lung-cancer-the-deadliest-form-of-cancer.php means they can spread into, or invade, nearby tissues. In addition, as these tumors grow, some cancer cells can break off and travel to distant places in the body through the blood or the lymph system and form new tumors far from the original tumor. Unlike malignant tumors, benign tumors do not spread into, or invade, nearby tissues.
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Benign tumors can sometimes be quite large, however. Unlike most benign tumors elsewhere in link body, benign brain tumors can be life threatening. Cancer cells differ from normal cells in many ways that allow them to grow out of control and become invasive. One important difference is that cancer cells are less specialized than normal cells.
That is, whereas normal cells mature into very distinct cell types with specific functions, cancer cells do not. This is one reason that, unlike normal cells, cancer cells continue to divide without stopping.
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In addition, Instjtute cells are able to ignore signals that normally tell cells to stop dividing or that begin a process known as programmed cell death, or apoptosis, which the body uses to get rid of unneeded cells. Cancer cells may be able to influence the normal cells, molecules, and blood vessels that surround and feed a tumor—an area known as the microenvironment. For instance, cancer cells can induce nearby normal cells to form blood vessels that supply tumors with oxygen and nutrients, which they need to grow. These blood vessels also remove waste products from tumors.
Cancer cells are also often able to evade the immune system, a network of organs, tissues, and specialized cells that protects the body from infections and other conditions. Tumors can also use the immune system to stay alive and grow. For example, with the help of certain immune system cells that normally prevent a runaway immune responsecancer cells can actually keep the immune system from killing cancer cells. Cancer is caused by certain changes to genes, the basic physical units of inheritance.
Genes are arranged in long strands of tightly packed DNA called chromosomes. Cancer is a genetic disease—that is, it is caused by changes to genes that control the way our cells function, especially how they grow and divide.
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Genetic changes that cause cancer can be inherited from our parents. Cancer-causing environmental exposures include substances, such as the chemicals in tobacco smoke, and radiation, such as ultraviolet rays from the sun. Our Cancer Causes and Prevention section has more information. As the cancer continues to grow, additional changes will occur. Even within the same tumor, different cells may have different genetic changes. In general, cancer cells have more genetic changes, such as mutations in DNA, than normal cells. Some of these changes may have nothing to do with the cancer; they may be the result of the more info, rather than its cause.]
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