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How Cancer Grows

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Beautiful Edden

on 1 February 2011

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Transcript of How Cancer Grows

There are many different types of
cancers, but how do they get started? A cell's life can be divided
in 2 sections Mitosis The process where the nucleus
of the cell divides to form to nuclei And Interphase A long stage after cell division where the
growth and DNA replication occur. This is
where the majority of cell's life is spent. There are three stages of interphase G1 phase S phase G2 phase Cells in this stage will work and
grow until it gets too large to
continue normal daily activity. cells
will have to decide to "divide" or
"die" at this point. Cells will make a copy of its
DNA.This is also known as
DNA replication. "Nesting" phasecell gathers energy to
get ready for the big event called "mitosis."
At this point, if any mistakes in the DNA
replication have occurred, the cell will either
repair it or will terminate! DNA mutation starts in the S phase. If one of the base pairs is different from the original in a rung of the DNA ladder then this DNA has suffered a mutation. Exposure to chemicals such as Carcinogen,

the mis-copying when its parent cell divides,

radiation, or even to much sun can be the

cause of this mutation. Genetic mutation will sometimes
cause a cell and its descendants
to reproduce unchecked and before
long, compress the normal cells
around them. After about a period of ten years,
the growth may contain one
million cells. After about a million divisions, there's a good chance that one of the new cells will have
mutated further which now carrying 2 mutant genes could have an altered apperrance and be even more prone to reproduce unchecked. How Cancer Grows A mutation may also simply cause a cell
to keep from self-destructing as well as
give it some further advantage, so that the cell will grow more vigorously than its predecessors and thus speed up the growth tumor. Also the new type of cells grow rapidly, allowing
for more opportunities for mutations. The newer, wildre cells created by another
mutation are unable to push aside thier
way through the epithelial tissue's
basement membrane. gbhjk
The newer, wilder cells created by another mutation are unable
to push aside thier way through the epithelial tissue's basement membrane Angiogenesis is the recruitment of new blood
vessels, from the network of nieghboring vessels. Without blood and nutrients it carries, a
tumor would be unable to continue growing. With the new blood supply, however, the growth of
the tumor accerates and it soon contains one billion cells. The tumor has now invaded the tissue
beyond the basement membrane. Individual cells from the tumor enter into the network of newly formed blood vessels, using these as highways by which they can move to other parts of the body to establish new tumor sites at ither locations. To form a new colony, a tumor cell needs
to leave the vessels system and invade tissue. The cell must attach to a vessel's wall. Once this is done, it can work its way
through the vessel and enter the tissue.
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