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Senescence: Difference between revisions
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== Apoptosis == | == Apoptosis == | ||
Programmed cell death is called apoptosis. This is commonly seen in plants, but can happen in all kinds of organisms. There are two main reasons for an organism to kill its own cells: It is needed for proper dvelopment, and it is needed to destroy cells that pose a threat to the entire organism. This can be seen in the development of the human brain, where synapses must form by getting rid of surplus cells through apoptosis, or destroying cancer cells or cells infected with viruses through induced apoptosis. [http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Apoptosis.html] | Programmed cell death is called [[apoptosis]]. This is commonly seen in plants, but can happen in all kinds of organisms. There are two main reasons for an organism to kill its own cells: It is needed for proper dvelopment, and it is needed to destroy cells that pose a threat to the entire organism. This can be seen in the development of the human brain, where synapses must form by getting rid of surplus cells through apoptosis, or destroying cancer cells or cells infected with viruses through induced apoptosis. [http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Apoptosis.html] | ||
There are three different ways that a cell can start the process of apoptosis. The first is to trigger it by sending internal signals through the mitochondrial pathway. The second way is through external signals through the death receptor pathway. Finally, the cell can trigger apoptosis through an inducing factor. [http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Apoptosis.html] | There are three different ways that a cell can start the process of apoptosis. The first is to trigger it by sending internal signals through the mitochondrial pathway. The second way is through external signals through the death receptor pathway. Finally, the cell can trigger apoptosis through an inducing factor. [http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Apoptosis.html] | ||
