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Most people understand mitochondria function in regard to energy production. Learn how mitochondria function in cell death and regeneration. Mitochondrion, organelle found in most eukaryotic cells, the primary function of which is to generate energy in the form of adenosine triphosphate. Mitochondria also store calcium for cell signaling activities, generate heat, and mediate cell growth and death. Mitochondria : Definition, Functions , Diagram, Structure and Parts The mitochondria are cell organelles that helps in the production of energy in the form of ATP, through the process called cellular respiration. Mitochondria and its parts are briefly described here. Mitochondria have a double membrane structure and use aerobic respiration to generate adenosine triphosphate (ATP), which is used throughout the cell as a source of chemical energy. [2] . They were discovered by Albert von Kölliker in 1857 [3] in the voluntary muscles of insects.