The Krebs cycle is called the final the common pathway of the degradation of organic compounds because it is also possible to generate acetyl CoA from the degradation of lipids and proteins.
Since acetyl CoA is the substrate that triggers the Krebs cycle, this process is called the final common pathway for being activated by other organic molecules (lipids and proteins) and not only by glucose.
The organism uses energetic reserves of *** and proteins to cycle the Krebs cycle when undergoing malnutrition or when there is no glucose available for the cells.
