Aerobic and anaerobic respiration

• Respiration is a chemical process that releases energy from glucose.
• respiration is an exothermic reaction as it releases energy
• how do cells use energy from respiration:

  • combine small molecules to make larger ones
  • break large molecules into smaller ones
  • muscle contraction
  • maintain body temp
  • move substances around the cell
• metabolism is the combination of all the chemical reactions in an organism
• word equation for aerobic respiration:

  glucose + oxygen -> carbon dioxide + water
• symbol equation for aerobic respiration:

  • C6H12O6 + 6O2 -> 6CO2 + 6H20
• word equation for anaerobic respiration in animals :

  glucose -> lactic acid
• word equation for anaerobic respiration in plants and fungi:

  glucose -> ethanol + carbon dioxide
• Aerobic respiration produces more energy
• the ethanol produced can be used to make alcoholic drinks
• anaerobic respiration in making bread:

  • when baking bread we add yeast
  • there is limited oxygen in bread so they will respire anaerobically
  • this produces carbon dioxide which forms little bubbles
  • these pockets of gas make bread light and fluffy