Krebs Cycle and Electron Transport Chain Section 9-2

Krebs Cycle Location: matrix of mitochondria. First, pyruvic acid is broken down into Acetyl Co-enzyme A and then into Citric Acid. CO2 is produced Electron carriers produced: FADH2 and NADH. Net of 2 ATP are formed. (1 from each pyruvic acid from glycolysis)

Krebs Cycle Section 9-2

Krebs Cycle Reactants: Products: Pyruvic Acid becomes Acetyl Co-A becomes Citric Acid NAD+ and FAD+ used ADP used Products: CO2 produced NADH and FADH2 produced ….NET 2 ATP PRODUCED!

Electron Transport Chain Location: cristae (inner membranes) of the mitochondria. The electron carriers (NADH and FADH2) release their high energy electrons to carrier proteins. H+ ions move through ATP channel to generate the ATP. Oxygen is the final electron acceptor in the chain and combines with the H+ ions = H2O. Net total of 32 ATP. Animation

ETC Section 9-2 Electron Transport Hydrogen Ion Movement Channel Mitochondrion Intermembrane Space ATP synthase Inner Membrane Matrix ATP Production

ETC Reactants: Products: NADH and FADH2 release electrons and H+ ions which move through ATP synthase… Electrons added to H+ and O2 … Products: NAD+ and FAD+ produced …producing ATP …forming H2O NET 32 ATP

Energy and Exercise ATP in muscles and Creatine Phosphate to generate more ATP Lactic Acid Fermentation

Chloroplasts Mitochondria CO2 and H2O C6H12O6 and O2 C C6H12O6 and O2 CO2 and H2O 6CO2 + 6H2O C6H12O6 + 6O2 6O2 + C6H12 O6 6H20 + 6CO2