1. (AKA: Anaerobic Respiration)
Fermentation
(AKA: Anaerobic Respiration)

2. Quick Review Cellular Respiration: Glycolysis – anaerobic
2) Citric Acid Cycle – aerobic
3) Electron Transport Chain - aerobic
Aerobic = requires oxygen
Anaerobic = does not require oxygen

3. Fermentation = Anaerobic Respiration
Occurs when cells have to go without enough oxygen for a short amount of time
Glycolysis happens as normal
Kreb’s cycle and ETC cannot b/c there is no oxygen
Two types of fermentation:
Lactic Acid Fermentation
Alcoholic Fermentation

4. Lactic Acid Fermentation
When cells can’t get enough oxygen, the ETC can’t transfer electrons.
Electron carrier FADH2 can’t dump it’s electrons...it’s stuck with them
Electron carrier NADH finds a different way to make ATP: fermentation!

5. ETC in Mitochondria

6. Lactic Acid Fermentaion
Glucose is 1st broken into 2 pyruvate (glycolysis)
2 NADH are used
Each pyruvate becomes lactic acid
2 ATP are made
*Much debate centers on the role of lactic acid in muscle performance
*Lactic acid is eventually converted back to pyruvate in the liver

7. Lactic Acid Fermentation

8. Alcoholic Fermentation
Done by yeast and some bacteria
Convert glucose into pyruvate and then into CO2 and ethyl alcohol
2 NADH are used
2 ATP are made

9. Alcoholic Fermentation