Cell suicide

Apoptosis is a pathway of programmed cell death. The word apoptosis comes from a Greek word implying “leaves falling from a tree”. This most likely refers to the fragmenting of a cell that undergoes apoptosis. these cells have an innate self-destruction mechanism to actively kill themselves, when the need arises. It is for this reason that apoptosis is described to be "suicidal". Apoptosis, the process of controlled cell death, is necessary for the function of all multicellular organisms, including humans. Apoptosis removes cells that are no longer useful to maintain cell tissue homeostasis. It is responsible for eliminating 10 billion cells from the body each day, which is quite a huge figure.
Apoptosis is also needed to eliminate cells that have incurred DNA damage that cannot be repaired. I think that this article is interesting because i never knew that the body knew how to get rid of the damaged cells.

references: http://michelle-parker.suite101.com/apoptosis-cell-suicide-a399696