1. Cell death, Cancer cells and the Cell cycle
An insight into some of the reasons we age, and why we die.. And what can kill us

2. Cell death: Necrosis and Apoptosis
Necrosis is death due to unexpected and accidental cell damage.  A number of toxic chemical or physical events can cause necrosis: toxins, radiation, heat, trauma, lack of oxygen due the blockage of blood flow, etc.
- physical or chemical insults can lead to the lethal disruption of cell structure and activity
As necrotic cells begin to die, they swell – holes appear in the plasma membrane and intracellular materials spill out into the surrounding environment.

3. But outside the obvious reasons, why would cells still choose to die?
Cell death cont’d
Apoptosis
Apoptosis is sometimes called programmed cell death.
Apoptosis originally referred to the process by which leaves falls from trees in the autumn, but it has been adapted to describe this type of non-traumatic cell death.
Apoptosis is a way to remove unwanted cells. During apoptosis, cellular contents are not released and inflammation does not occur. The apoptotic cells are rapidly engulfed by their neighbours and removed.
But outside the obvious reasons, why would cells still choose to die?

4. Cancer cells What are cancer cells, and where do they come from?
Cells with abnormal genetic material that are dividing uncontrollably and can spread to other body parts.
So, how do these cells manage to get out of hand?