The entire three stage energy harvesting process is

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The entire three stage energy harvesting process is referred to as oxygen-dependent or  aerobic energy transfer Cellular respiration: the aerobic harvesting of energy In Eukaryotic cells, glycolysis takes place in the watery material that lies outside of the  cell’s nucleus (cytosol) While in the Krebs cycle and ETC takes place within tiny organelles called mitochondria that are immersed in the cytosol
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03:17 First Stage of Respiration: Glycolysis Glycolysis: first stage of energy harvesting meaning sugar splitting which is appropriate  because our starting molecule is the simple sugar glucose First, one molecule of glucose must be prepared in a sense for energy release ATP actually has to be used rather than synthesized, in two of the first steps of  glycolysis, so that the relatively stable glucose can be put into the form of a less stable  sugar  Sugar is then split in half; the two molecules formed have three carbons each (starting  glucose molecule had 6) now glycolysis is ready to take place Glycolysis accomplishes three valuable things: 1. Yields two ATP molecules 2. Yields two energized molecules of NADH 3. Results in two molecules of pyruvic acid These pyruvic acid molecules are the derivatives of the original glucose molecule Now they are molecules that will be oxidized (have electrons removed from them) SO FAR 1. The three main stages of oxygen dependent or aerobic energy harvesting are  glycolysis Krebs cycle , and the  ETC . The first of these takes place in the cells  cytoplasm , while the second and third take place in cellular organelle called  mitochondria . 2. While the first two of these stages do yield some ATP, their most important contribution to energy harvesting is the channeling off of the energetic electrons used to bring about the large harvest of ATP in the ETC .
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03:17 Second Stage of Respiration: The Krebs Cycle Second stage of cellular respiration Because the first product of the Krebs cycle is citric acid, it is sometimes referred to as  the citric acid cycle Site of Action Moves from Cytosol to Mitochondria Energy harvesting quickly shifts with the pyruvic acid to the new site of energy transfer  which is the mitochondria Krebs cycle reactions take place to the interior of the inner membrane (area known as  inner compartment) while the reactions of the ETC take place within the inner  membrane Between Glycolysis and Krebs, An Intermediate Step There is a transition step in respiration between glycolysis and the Krebs cycle In it, the three carbon pyruvic acid molecule combines with a substance called  coenzyme A, thus forming acetyl coenzyme A Outcome of this is that acetyl CoA enters the Krebs cycle as the derivative of the original  glucose molecule
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