The mitochondrion (plural mitochondria) is adouble membrane-bound organellefound in alleukaryotic organisms. Some CELLS in some multicellular organisms may however lack them (for example, mature mammalian red bloodcells). A number of unicellular organisms,such as microsporidia, parabasalids, and diplomonads, have also reduced or transformed their mitochondria into other structures.[1] To date, only one eukaryote, Monocercomonoides,is known to have completely lost its mitochondria. The WORD mitochondrion COMES from the Greek "granule" or"grain-like". Mitochondria generate most of the cell's supply ofadenosine triphosphate (ATP), used as a source of chemical energy.

The most prominent roles of mitochondria are to produce the energy currency of the cell, ATP (i.e., phosphorylation of ADP), through respiration, and to regulate CELLULAR metabolism. The central set of reactions involved in ATP production are collectively known as the citric acid cycle, or the Krebs cycle. However, the mitochondrion has many other functions in addition to the production of ATP.


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