The mitochondria is 2 to 10 micrometers long and between 0.5 and 1 micrometer thick. It is enclosed in a double membrane. The inner membrane is called the cristae and it actually where the chemical energy ATP is synthesized. The mitochondria is found in greater numbers in animal cells than in plant cells, but they are found in plant cells too. The mitochondria is responsible for cell respiration, the process of converting glucose into ATP the energy currency of the cell. There may be several hundred per cell depending on the amount of cell respiration that occurs in that cell. Mitochondria contains small amounts of RNA and DNA, which lends credence to the line of thought that the mitochondria may have been a single cell and evolved as a part of a eukaryotic cell.
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