Systematically explains the core biological processes of cell damage, aging and death, covering reversible damage (such as endoplasmic reticulum and mitochondria swelling, myeloid structure formation), morphological characteristics of irreversible damage progressing to necrosis (cell membrane rupture, content leakage and inflammatory response), and programmed death - the typical path of apoptosis (chromatin condensation, cell fragmentation to form apoptotic bodies, phagocyte clearance).