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6. What is Oxygen debt?

  • The amount of oxygen that must flow through muscles to oxidise and remove the lactic acid the has built up
  • The amount of oxygen needed to oxidise the CO2 produced in Aerobic respiration
  • The amount of Oxygen needed to normalise the Oxygen levels in the blood after exercise

7. What does oxygen oxidise lactic acid into?

  • Water and Carbon dioxide
  • Water and hydrogen
  • Carbon dioxide
  • Water

8. What is used in Aerobic respiration that is NOT used in anaerobic?

  • Oxygen
  • Water
  • Carbon Dioxide
  • Glucose

9. What is the only reactant during anaerobic respiration?

  • Protein
  • glucose
  • Carbon dioxide
  • water

10. Which change does NOT take place during exercise?

  • Depth of breathing increases
  • Heart rate increases
  • Enzymes denature
  • Breathing rate increases

11. What do the changes to breathing and heart rate during exercise cause?

  • Arteries constrict (stopping blood flowing away from muscles)
  • Quicker rate of Gaseous exchange in lungs (so respiration can happen more quickly) and arteries dilate
  • Stomach digests food more quickly
  • Nerve impulses are sent to brain more quickly

12. What does lactic acid cause?

  • increased rate of digestion
  • muscle fatigue (muscles stop contracting efficiently and hurt)
  • Neutralisation of water in muscles
  • Muscles to increase in size