5.7 Electron Transport Chain Unit 5: Cell Energy 5.7 Electron Transport Chain

Produces from both the Krebs Cycle and glycolysis feed into the last step of cellular respiration

Electron Transport Chain The last set of reactions in cellular respiration that uses the high energy electrons from the previous reactions to convert ADP into ATP Electron carriers NADH and FADH2 from glycolysis and the Krebs cycle pass their electrons to the electron transport chain.

Summary Takes place in the inner mitochondrial membrane

Summary Aerobic

Summary Uses proteins and the enzyme ATP Synthase to make ATP Electrons/Hydrogen ions from the electron carriers are passed down the protein chain releasing energy Oxidative phosphorylation: Energy generated by the electron transport chain is used to move hydrogen ions across the mitochondrial membrane and into the intermembrane space Hydrogen passes back across the membrane and ATP synthase generates ATP from ADP

Summary Products of the electron transport chain: Each NADH converts to 3 ATP Each FADH2 converts to 2 ATP H20 https://www.youtube.com/watch?v=kN5MtqAB_Yc

Total ATP produced in Cellular Respiration per glucose molecule: Glycolysis: 2 ATP Krebs Cycle: 2 ATP 10 NADH: 28 ATP 2 FADH2: 4 ATP _______________________________ 36 ATP TOTAL

Cytosol Mitochondria 2ATP 4ATP 6ATP 18ATP 4ATP 2ATP 2 ATP 2NADH 6NADH Glucose Glycolysis 2ATP 4ATP 6ATP 18ATP 4ATP 2ATP 2 ATP (substrate-level phosphorylation) 2NADH 6NADH Krebs Cycle 2FADH2 2 Pyruvate 2 Acetyl CoA ETC and Oxidative Phosphorylation Cytosol Mitochondria