Where are we going with this? The information on this page should increase understanding related to this standard: Model and understand aerobic respiration demonstrating the flow of matter and energy out of a cell and explain energy transfer systems. Also, compare aerobic respiration to alternative processes of glucose metabolism.
So, this process has three names, actually!
It "is a central driver of cellular respiration. It takes acetyl CoA—produced by the oxidation of pyruvate and originally derived from glucose—as its starting material and, in a series of redox reactions, harvests much of its bond energy in the form of NADH, FADH2, and ATP molecules. The reduced electron carriers—NADH and FADH2—generated in the TCA cycle will pass their electrons into the electron transport chain and, through oxidative phosphorylation, will generate most of the ATP produced in cellular respiration (Source 2021-11).
Glycolysis is an anaerobic reaction taking place in the cytosol. If there is no oxygen present, then fermentation occurs. But!!! If oxygen is present, then it passes two 3-carbon pyruvate (pyruvic acid) on to the Krebs cycle.
| aerobic - with oxygen
anerobic - without oxygen
The Krebs cycle occurs in the mitochondrion. Specifically, the Krebs Cycle takes place in the matrix inside the mitochondrion.
- 2 CO2
- 3 NADH
- 1 FADH2
- 1 ATP
- 4 CO2
- 6 NADH
- 2 FADH2
- 2 ATP