1. Aerobic respiration: the Krebs cycle & electron transport system What happens in the mitochondria does not stay in the mitochondria

2. Aerobic Respiration Occurs in the mitochondria.Occurs in the mitochondria. Composed of two processes:Composed of two processes: –Citric acid cycle (Krebs). –Electron Transport System (ETS) Mitochonodria located in a muscle cell

3. Krebs cycle: aka Citric acid cycle Occurs in the matrix.Occurs in the matrix. Uses pyruvic acid as a raw materialUses pyruvic acid as a raw material uses oxygenuses oxygen Produces: 2 ATP, NADH & FADH 2Produces: 2 ATP, NADH & FADH 2 Waste product is carbon dioxide.Waste product is carbon dioxide.

4. Electron Transport System Occurs in the cristaeOccurs in the cristae Produces 34 ATPProduces 34 ATP Uses NADH & FADH 2 in order to store hydrogen.Uses NADH & FADH 2 in order to store hydrogen. Uses oxygenUses oxygen Waste product is water.Waste product is water.

5. ATP Production Summary Glycolysis.Glycolysis. –4 ATP produced - 2 ATP used = 2ATP Gained Citric Acid Cycle (Krebs)Citric Acid Cycle (Krebs) –2 ATP Produced. Electron Transport SystemElectron Transport System –34 ATP Produced Total ATP Produced from each glucose molecule = 38 ATPTotal ATP Produced from each glucose molecule = 38 ATP

6. Efficiency Comparison Anaerobic respiration ------ 2% Aerobic respiration --------- 66% More energy from More energy from the same food! = the same food! = More bang for More bang for your Buck! your Buck! the dollar store = aerobic Whole foods = anaerobic

7. Reactants and Products Process GlycolysisGlycolysis Citric Acid CycleCitric Acid Cycle ETSETSReactantsGlucose Pyruvic acid (Acetyl CoA) NADH & FADH 2 Products Pyruvic acid & NADH NADH & FADH 2 Carbon dioxide Water Start with glucose in glycolysis, add O 2 during Krebs cycle & CO 2 is produced, during ETS water is produced.