Necrosis. Apoptosis. Two terms that are used to describe cell death, but they have different definitions. How do necrosis and apoptosis differ?

Whereas apoptosis is a form of cell death that is generally triggered by normal, healthy processes in the body, necrosis is cell death that is triggered by external factors or disease, such as trauma or infection. Apoptosis, which can also occur as a defense mechanism during healing processes, is almost always normal and beneficial to an organism, while necrosis is always abnormal and harmful. Though necrosis is being researched as a possible form of programmed cell death (that is, a sometimes natural process), it is considered an "unprogrammed" (unnatural) cell death process at this time. As a usually healthy form of a cell's life cycle, apoptosis rarely demands any form of medical treatment, but untreated necrosis can lead to serious injury or even death.

B) Apoptosis is a form of programmed cell death, sometimes called cell while necrosis occurs due to injury, toxins or lack of oxygen.