Through a fascinating process called oxidative phosphorylation, oxygen is used by the mitochondria to absorb electrons & help generate energy. This video uses beautiful, high definition 3D visualisation to take a look inside the human body to follow the path the oxygen molecules take from the in breath, osmosis through the arterial membrane, bound by haemoglobin in red blood cells, to reach the mitochondria. Once inside the mitochondria, the powerhouse of all cells, we demonstrate how oxygen is used to produce energy. This process includes the oxidation of macronutrients, electron carriers such as NADH, the electron transport chain & the cytochrome oxidase complex. Creative imagery has been used in this video to facilitate your understanding of the process of oxidative phosphorylation. We welcome your feedback & suggestions re: future topics you would like to see 3Dme produce for the upcoming App Video Catalogue.