The G0 phase, G zero phase, or 'resting phase' is a period in the cell cycle in which cells exist in an inactive state.
They are not growing, doubling, or dividing.
This happens for two reasons:
The organism doesn’t need any more cells right now because they are done growing and don’t need any old/dead cells to be replaced.
They are cells that don’t keep being made like nerve cells and heart muscle cells.
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Cancer
The body is made up of hundreds of millions of living cells. Normal body cells grow, divide, and die in an orderly fashion.
Cancer starts when cells in a part of the body start to grow out of control. There are many kinds of cancer, but they all start because of out-of-control growth of abnormal cells.
Cancer cell growth is different from normal cell growth. Instead of dying, cancer cells continue to grow and form new, abnormal cells.
Cells become cancer cells because of damage to DNA. In a normal cell, when DNA gets damaged the cell either repairs the damage or the cell dies. In cancer cells, the damaged DNA is not repaired, but the cell doesn’t die like it should.
Instead, this cell goes on making new cells that the body does not need. These new cells will all have the same damaged DNA as the first cell does.