1. Aerobic Cellular Respiration
The Payoff: ETC
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2. 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

3. 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

4. Electron transport chain

5. 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

6. Electron transport chain

7. 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

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

9. 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

10. 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