Aerobic and anaerobic respiration

• What is the purpose of respiration in organisms?

  To release energy to fuel their living processes
• What are the two types of respiration mentioned?

  Aerobic and anaerobic respiration
• What is the main respiratory substrate used in respiration?

  Glucose
• What is aerobic respiration?

  Respiration that requires oxygen to break down food molecules
• What is the word equation for aerobic respiration?

  glucose + oxygen → carbon dioxide + water + energy released
• What are the chemical symbols for the reactants and products of aerobic respiration?

  C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy released
• Where do the first stages of respiration occur in cells?

  In the cytoplasm of cells
• Where does most of the energy released during respiration occur?

  In the mitochondria
• What is anaerobic respiration?

  Respiration that occurs without oxygen
• Which human tissue can respire anaerobically for short periods?

  Human muscle
• What is produced when glucose is converted in human muscle during anaerobic respiration?

  Lactic acid
• What is the equation for anaerobic respiration in human muscle?

  glucose → lactic acid + energy released
• What do some plants and fungi use for anaerobic respiration?

  They use the process of anaerobic respiration
• What is produced during anaerobic respiration in yeast?

  Ethanol and carbon dioxide
• What is the equation for anaerobic respiration in yeast?

  glucose → ethanol + carbon dioxide + energy released
• Compare aerobic and anaerobic respiration in terms of oxygen presence and energy release.

  • Aerobic:
  • Presence of oxygen: Present
  • Amount of energy released: Relatively large amount
  • Anaerobic:
  • Presence of oxygen: Absent or in short supply
  • Amount of energy released: Small amount, but quickly
• What are the products of aerobic and anaerobic respiration?

  • Aerobic respiration:
  • Products: Carbon dioxide and water
  • Products do not contain stored chemical energy
  • Anaerobic respiration:
  • Mammalian muscle: Lactic acid
  • Yeast: Ethanol and carbon dioxide
  • Some plants: Ethanol and carbon dioxide
  • Products still contain stored chemical energy
• What is the significance of anaerobic respiration for organisms?

  • Allows survival in low oxygen conditions
  • Enables quick energy release for short bursts of activity
  • Important for certain organisms like yeast and some plants