Catabolism Electron Transport Catabolism -- Overview Catabolism -- Glycolysis 4 ADP + P i Catabolism -- Glycolysis Glucose (6C) 2 pyruvate (3C) 2 ATP 2 ADP + P i 4 ATP 2 NAD 2 NADH Catabolism -- Glycolysis Catabolism -- Overview Catabolism -- Decision O 2 present O 2 absent Intermediate Reaction Krebs cycle Electron transport & Oxidative phosphorylation Fermentation Catabolism -- Fermentation Does not require oxygen Recycles NADH to NAD Allows glycolysis to occur Many types Humans Lactic acid fermentation Yeast Ethanolic fermentation Catabolism -- Fermentation Catabolism -- Decision O 2 present O 2 absent Intermediate Reaction Krebs cycle Electron transport & Oxidative phosphorylation Fermentation Catabolism Krebs Cycle Catabolism Electron Transport Catabolism -- Overview