2.8  Cell Respiration

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Essential Idea:

Cell respiration supplies energy

for the functions of life


  • Cell respiration is the controlled release of energy from organic compounds to produce ATP
  • ATP from cell respiration is immediately available as a source of energy in the cell
  • Anaerobic cell respiration gives a small yield of ATP from glucose
  • Aerobic cell respiration requires oxygen and gives a large yield of ATP from glucose


  • Use of anaerobic cell respiration in yeasts to produce ethanol and carbon dioxide in baking
  • Lactate production in humans when anaerobic respiration is used to maximise the power of muscle contractions


  • Analysis of results from experiments involving measurement of respiration rates in germinating seeds or invertebrates using a respirometer