Mitochondria have long been characterised as cellular powerhouses, yet emerging research reveals their role extends far beyond ATP generation. These organelles simultaneously regulate oxidative stress, preserve genetic integrity, and orchestrate cell survival decisions through interconnected metabolic pathways. As mitochondria produce energy via the tricarboxylic acid cycle and electron transport chain, they generate reactive oxygen species that must be carefully managed by antioxidant enzymes including superoxide dismutase and glutathione peroxidase. Additionally, mitochondrial DNA encodes essential electron transport chain proteins whose integrity declines with age. Understanding these four primary mitochondrial functions provides critical insights into why dysfunction underpins metabolic syndrome, cardiovascular disease, and neurodegenerative conditions. Cellular longevity depends on maintaining mitochondrial health through continuous fission, fusion, and removal of damaged organelles via mitophagy.
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