cell death

Cell death, a relatively recent area of study, occurs in two primary ways: necrosis and apoptosis. Necrosis is an accidental form of cell death resulting from external factors like injury, toxins, or oxygen deprivation. It involves cell swelling, organelle disruption, and eventual rupture of the cell membrane and nucleus. This process is often seen in pathological conditions and can be diagnostically significant.12

In contrast, apoptosis, or programmed cell death, is an internally regulated process crucial for normal development and tissue maintenance. It occurs in a controlled manner, leading to cell shrinkage and fragmentation, which are then cleared by scavenger cells. This "death by design" is essential for shaping organs during embryonic development and for processes like metamorphosis. While necrosis is a response to damage, apoptosis is a deliberate cellular event.1