Video - Necrosis and apoptosis

Necrosis is a type of cell death that occurs when cells are damaged by external factors like an infection, as well as internal factors like tissue ischemia. There are six types of necrosis: coagulative and gangrenous necrosis, which happen to hypoxic tissues; liquefactive necrosis, which happens because of hydrolytic enzymes; caseous necrosis - like in tuberculosis; fat necrosis, which happens when fatty acids spill outside adipose cells, like during trauma, and finally fibrinoid necrosis - which is caused by fibrin deposits, like in malignant hypertension.

Apoptosis, on the other hand, is a programmed cell death that occurs when the body needs to get rid of damaged or unnecessary cells. Apoptosis occurs due to intrinsic and extrinsic pathways. With apoptosis, white blood cells come in and clean up the dead tissue, so this is a neat way for cells to die.