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Fermentation (anaerobic respiration) •No oxygen •Many different types 2 examples: • Alcoholic fermentation – in yeast Pyruvate acetaldehyde + CO2 ethanol (alcohol) • Lactic acid fermentation – Animal cells (when no O2 available) If no O2 then: • • • • NADH builds up No NAD+ available Glycolysis and Krebs shut down But, fermentation allows glycolysis to occur (it generates NAD+) Glucose lactic acid (in our muscles) – Lactic acid builds up (muscle pain & fatigue) – Oxygen debt