From: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CellularRespiration.html. They also discuss mitochondrial DNA (mtDNA) on this page and how mutations in mitochondrial DNA cause disease (such as exercise intolerance).
Mitochondria are membrane-enclosed organelles distributed through the cytosol of most eukaryotic cells. Their main function is the conversion of the potential energy of food molecules into ATP. Mitochondria have:
The Outer Membrane
The outer membrane contains many complexes of integral membrane proteins that form channels through which a variety of molecules and ions move in and out of the mitochondrion.
The Inner Membrane
The inner membrane contains 5 complexes of integral membrane proteins:
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