Anaerobic respiration

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  • Created by: Steff06
  • Created on: 03-03-16 18:22
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  • Anaerobic respiration
    • If OXYGEN is ABSENT, the Electron Transport Chain cannot function and so the Link Reaction and Krebs Cycle also stop.
    • GLYCOLYSIS is now the only source of ATP. Reduced NAD has to be REOXIDISED so glycolysis can continue.
    • FUNGI e.g. YEAST can reoxidise NAD through ethanol/ ALCOHOLIC FERMENTATION.
      • ETHANAL is the hydrogen acceptor.
      • CO2 and ATP are produced. Reduced NAD is reoxidised.
      • The end products are ETHANOL and CO2.
      • The enzymes involved are PYRUVATE DECARBOXYLASE and ETHANOL DEHYDROGENASE.
      • PYRUVATE --> ETHANAL --> ETHANOL
    • Animals reoxidise NAD by LACTATE FERMENTATION
      • Occurs in MAMMALS during EXERCISE.
      • Reduced NAD must be REOXIDISED to NAD. PYRUVATE is the hydrogen acceptor.
      • ATP and reoxidised NAD are produced. CO2 is NOT produced.
      • Final product produced is LACTATE. Enzyme involved is LACTATE DEHYDROGENASE.
      • PYRUVATE --> LACTATE
    • Lack of oxygen causes build up of LACTIC ACID. Causes muscle FATIGUE. Produces small amounts of ATP. Lactic acid is broken down in LIVER and MUSCLE cells.

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