Aerobic Cellular Respiration The Payoff: ETC Pages 178-181

Overview To this point (through Krebs cycle): Put in: Gotten out: 1 Glucose Gotten out: 6 Carbon dioxide 4 ATP 10 NADH 2 FADH2 Overview

Electron transport chain Final process of respiration Takes the potential energy found in the electrons being carried by NADH and FADH2 and converts it into ATP Occurs on the inner membrane of the mitochondria Electron transport chain

Electron transport chain

Electron transport chain Made up of: Four large membrane-bound complexes: Complex I Complex II Complex III Complex IV And two membrane-bound electron shuttles: Ubiquinone Cytochrome C Electron transport chain

Electron transport chain

Electron transport chain Need to know: General path of electrons for NADH and FADH2: Order of major complexes **Difference between the NADH and FADH2 pathways** Electron transport chain

Electron transport chain Oxygen is the final electron acceptor in the process 2e- + 2H+ + ½O2  H2O Electron transport chain

Electron transport chain The chain is made up of molecules with increasing electronegativity What happens to the energy of the electrons as they move through this chain? Electron transport chain

Electron transport chain End result: A proton gradient is setup across the inner-mitochondrial membrane NADH pumps H+ out three times (~10 e-) FADH2 pumps H+ out two times (~6 e-) Electron transport chain