Krebs cycle
The Krebs cycle (called after Hans Krebs) is a part of cellular respiration. Its other names are the citric acid cycle, and the tricarboxylic acid cycle (TCA cycle).
It is the series of chemical reactions used by all aerobic organisms to generate energy. It is important to many biochemical pathways. This suggests that it was one of the earliest parts of cellular metabolism to evolve.
The Krebs cycle comes after the link reactionand provides the hydrogen and electrons needed for the electron transport chain. It takes place inside mitochondria.