Respiration

• Respiration


  A process that supplies the energy needed by living organisms
• Respiration is an exothermic reaction because it releases energy and it takes place continually in all living cells
• Types of respiration


  • Aerobic respiration
  • Anaerobic respiration
• Aerobic respiration


  1. Glucose reacted with oxygen gas

  2. Produces carbon dioxide and water

  3. Releases energy
• Aerobic respiration


  Glucose molecule has been fully oxidized
• Glucose


  Oxygen
• Carbon dioxide


  Water
• Anaerobic respiration in muscles

  1. Glucose converted to lactic acid

  2. Does not require oxygen
• Anaerobic respiration


  • Releases much less energy than aerobic respiration
  • Oxidation of glucose is incomplete
• Anaerobic respiration in plants and yeast

  1. Glucose converted to ethanol and carbon dioxide

  2. Does not require oxygen
• Fermentation


  Anaerobic respiration in yeast cells, used to make alcoholic drinks and bread
• You will find plenty of questions on respiration in the revision workbook