Overview mitochondria structures Overview found in high concentrations in metabolically active cells Cell biology double membrane structure outer membrane login to view 1 more bullet inner membrane login to view 3 more bullets inner matrix contains circular DNA (mtDNA) login to view 14 more bullets Function oxidizes substrates NADH/FADH2 → NAH+/FAD generates ATP converts NADH/FADH2 into ATP via ETC stores Mg2+ and Ca2+ Mitochondrial Inheritance Pedigree Affected males transmit to none of their children Affected females transmit to all of their children