The MRI machine allowing us to see how the brain reacts to different stimuli is one.
Mitochondria produce ATP through process of cellular respiration—specifically, aerobic respiration, which requires oxygen. The citric acid cycle, or Krebs cycle, takes place in the mitochondria. This cycle involves the oxidation of pyruvate, which comes from glucose, to form the molecule acetyl-CoA. Acetyl-CoA is in turn oxidized and ATP is produced.
Mitochondria converts food energy into cell energy for the cell use this probides energy for the ribosome