1. Aerobic Respiration
Chapter 9 sec. 2

2. Aerobic Respiration
If oxygen is available, the pyruvic acid undergoes aerobic respiration

3. Aerobic Respiration
Kreb’s cycle
Electron Transport Chain

4. Mitochondria
Matrix – space inside the inner membrane

5. Mitochondria
Pyruvic acid from glycolysis diffuses into the mitochondria
Matrix contains enzymes to catalyze the reactions

6. Mitochondra
Enzymes convert pyruvic acid into Acetyl CoA (coenzyme A)

7. Krebs Cycle
Biochemical pathway that breaks down acetyl CoA into CO2 and ATP

8. Hans Krebs

9. Electron Transport Chain
2nd stage of aerobic respiration
Occurs in the cristae of the mitochondria

10. Electron Transport Chain
Excited Electrons are passed down a series of molecules
As they pass, they lose some energy

11. Electron Transport Chain
The energy lost is used to pump protons across membrane
This creates a concentration gradient of protons

12. Electron Transport Chain
Concentration gradient drives the production of ATP

13. Role of Oxygen
Last molecule of ETC has to unload its electrons on something
O2 is the final electron acceptor forming H2O

14. Total Products Glycolysis = 2 ATP Krebs = 2 ATP and CO2
ETC = 32 ATP and water

15. Relationship
6H2O + 6CO > C6H12O6+ 6O2