The cori-cycle is the mutual exchange between muscle and liver of lactate and glucose.
During anearobic glycolysis inside the muscle the glycogen that is stored there is converted into lactate which is transportet to the liver via the blood. There the lactate is dehydrogenised (LDH) into pyruvate which is then either converted into energy in the Krebs-cycle and the respiratory chain or made into glucose or glycogen via gluconeogenesis under fatty acid combustion. The resulting glucosed is then released into the blood in case of need and thus closes the cori-cycle.
(Picture: Petaholmes/PDH, Matt)