text: Mitochondria may have a number of different shapes. A mitochondrion contains outer and inner membranes composed of phospholipid bilayers and proteins. The two membranes have different properties. Because of this double-membraned organization, there are five distinct parts to a mitochondrion:
  # The outer mitochondrial membrane,
  # The intermembrane space (the space between the outer and inner membranes),
  # The inner mitochondrial membrane,
  # The cristae space (formed by infoldings of the inner membrane), and
  # The matrix (space within the inner membrane), which is a fluid.
  Mitochondria have folding to increase surface area, which in turn increases ATP (adenosine triphosphate) production.
  Mitochondria stripped of their outer membrane are called mitoplasts.