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Anaerobic respiration
Explain anaerobic respiration as the series of chemical processes in cells that decompose nutrient molecules to generate energy without the use of oxygen.
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90 min
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CambridgeIGCSEBiologyRespiration
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Anaerobic respiration outcomes7 objectives
- Explain anaerobic respiration as the series of chemical processes in cells that decompose nutrient molecules to generate energy without the use of oxygen.
- Indicate that anaerobic respiration produces significantly less energy from each glucose molecule compared to aerobic respiration.
- Provide the word equation for anaerobic respiration in yeast, which is: glucose → alcohol + carbon dioxide.
- Provide the word equation for anaerobic respiration in muscles during intense exercise, which is: glucose → lactic acid.
- Present the balanced chemical equation for anaerobic respiration in yeast as: C6H12O6 → 2C2H5OH + 2CO2.
- Indicate that lactic acid accumulates in muscles and blood during intense exercise, leading to an oxygen debt.
- Describe the process of how the oxygen debt is repaid after exercise, including: (a) the sustained elevated heart rate to transport lactic acid from muscles to the liver, (b) the continued deep and rapid breathing to provide oxygen for the aerobic breakdown of lactic acid, and (c) the aerobic metabolism of lactic acid in the liver.
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