In this video Paul Andersen explains the importance of oxygen in accepting electrons. He begins with a brief description of combustion. He then explains the role of oxygen in aerobic cellular respiration.

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Music Attribution
Title: String Theory
Artist: Herman Jolly
http://sunsetvalley.bandcamp.com/trac...

All of the images are licensed under creative commons and public domain licensing:
2007, Mitochondrial_electron_transport_chainEtc4 svg: Fvasconcellos 22:35, 9 September. Schematic Diagram of the Mitochondrial Electron Transport Chain., 11:32 (UTC). Mitochondrial_electron_transport_chain—Etc4.svg. http://commons.wikimedia.org/wiki/Fil....
Armtuk. Periodic Table Based on HTML Table Found in Wikipedia, April 28, 2007. Own work. http://commons.wikimedia.org/wiki/Fil....
Maw. Ratn | Mouse, n.d. http://openclipart.org/detail/159673/....
Nevit. English: Mitochondria, June 2010. Own work. http://commons.wikimedia.org/wiki/Fil....
shokunin. Silhouette Sport Disciplines Set, n.d. http://openclipart.org/detail/76813/s....
Ulflund. English: Spacefilling Model of the Oxygen Molecule (O2) Created with Jmol (http://chemapps.stolaf.edu/jmol/jmol...., July 18, 2012. Own work. http://commons.wikimedia.org/wiki/Fil....
Valessio Soares de Brito. Fire, n.d. http://openclipart.org/detail/23803/f....