The Krebs cycle is a series of reactions that can be depicted in a circular fashion, hence the term cycle. These reactions are termed the tricarboxylic acid cycle (TCA) or the Krebs cycle to acknowledge the individual chiefly responsible for discovering the reactions.
In terms of ATP production, the Krebs cycle extracts high energy electrons from carbon containing compounds in the form of NADH or FDH2. The energy of these electrons is used to synthesize the bulk of the ATP that cells make through a process called oxidative phosphorylation.
To understand the Krebs cycle and how it is connected to glycolysis examine the lower-left figure.
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