Western Medicine Essay - amazonia.fiocruz.br

Apologise: Western Medicine Essay

Western Medicine Essay Video

Cells are organized into tissues and tissues are organized into organs with specific functions, such as the heart, lungs and skin.

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The cells of each organ must work and communicate as a team to function properly. When growth is necessary, cells collectively send signals to other cells to divide. Cancer cells, on the other hand, do not behave as team members.

They control their own proliferation by producing growth signals themselves or by having overactive signal receptors. Just as there are signals that stimulate cell proliferation, there Western Medicine Essay signals that put the brakes on cell growth and proliferation. Cancer cells are able to interrupt or ignore these inhibitory messages. When cells become old or damaged they are programmed to die in a process called apoptosis.

Cancer cells are dangerous because they avoid the normal cell death cycle and continue to accumulate in the body. Apoptosis signals can be disrupted when tumor suppressor genes suffer mutations or other damage. The accumulation of the billions of cells it takes to form a tumor Mexicine uncontrolled cell division, avoidance of apoptosis and the ability to replicate an unlimited number of times.

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In normal cell division, a small portion of the end of each chromosome, in a region called the telomere, is lost every time DNA is copied. Eventually the loss of telomere reaches a critical point and the cell can no longer divide and replicate.

In this way, healthy cells self-limit their replication, but activation of an enzyme called telomerase can maintain telomeres and allow the cell to continue to replicate indefinitely. In order for a tumor to grow it needs a greater and greater blood supply to provide oxygen and nutrients to the increasing Westedn of cells. A tumor is able to stimulate formation Western Medicine Essay new blood vessels, a process known as angiogenesis, to supply it with adequate nutrients and promote its growth.

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Cancer cells, unlike normal cells, can metastasize — break through tissue barriers and spread from one organ to another. Sometimes they do this by entering the newly https://amazonia.fiocruz.br/scdp/essay/essay-writing-format-cbse-class-12/life-changing-events-happened-from-new-york.php blood vessels created by the tumor. Even with an increased blood supply, Westenr in the interior of a tumor may be oxygen- and nutrient-deprived.]