Mitochondrion

(Pl mitochondria; Greek μίτος - thread, strand; Greek χόνδρος - granule, grain); structure responsible for producing energy for the cell in most eukaryotic through cellular respiration

Description
A mitochondrion is a membrane-enclosed organelle ranging in size from 0.5–10 &Mu;m in diameter. Mitochondria produce most of the cellular adenosine triphosphate (ATP), the intracellular 'currency' of energy, and have critical roles in signaling, cellular differentiation, cell death (apoptosis), cell-cycle control and cell growth. Mitochondria have been implicated in several human diseases, including mitochondrial disorders and cardiac dysfunction.