Citric acid cycle (krebs cycle)
1) acetyl-CoA molecule enters the cycle and binds to oxaloacetate, creating a six-carbon molecule.
2) The six-carbon molecule donates electrons to NAD+, creating NADH. Two carbon dioxide molecules are released into the atmosphere.
3) The remaining four-carbon molecule is rearranged to form oxaloacetate. In the process, ATP is formed, and electrons are passed to NADH and FADH2.