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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. Structure of the Mitochondria Mitochondria are membrane-bound organelles enclosed by a double membrane. They have a smooth outer membrane enclosing the organelle and a folded inner membrane. The folds of the inner membrane are called cristae, the singular of which is crista, and the folds are where the reactions creating mitochondrial energy take place. The inner membrane contains a fluid called the matrix while the intermembrane space located between the two membranes is also filled with ... Mitochondria are the critical structures of the cell composed of double membranes responsible for energy production. Explore 6 major mitochondria functions .