spherical to oblong membrane-delimited organelle
2 layers of membrane - outer and inner membranes are separated by an intermembrane space
inner membrane is folded into cristae which limit a matrix in the intercristal space
the mitochondrial matrix contains most of the enzymes of citric acid cycle as well as fatty acid oxidation
inside of each crista is studded with particles involved in the synthesis of adenosine triphosphate (ATP)