Respiration
PET scanning (Positron Electron Tomography) a study by Alan Zametkin shows a change in glucose metabolism in the brain in the condition Minimal Brain Dysfunction and the book "The Oxygen Revolution" by Paul Harch, MD shows how PET scanning helps in his evaluation of SCUBA divers with a type2 (neurologic) hit.
Read more about this topic: Carbohydrate Catabolism