Aerobic and Anaerobic respiration

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1. What does lactic acid cause?

  • muscle fatigue (muscles stop contracting efficiently and hurt)
  • Neutralisation of water in muscles
  • increased rate of digestion
  • Muscles to increase in size
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2. What stored substance is converted into glucose during exercise to produce energy?

  • Glycogen
  • Glucagon
  • Starch
  • Fat

3. Which of these is NOT a use of the energy released in respiration?

  • Diffusion of Oxygen and CO2, and Osmosis
  • Used to build up larger molecules from small molecules (e.g Proteins from amino acids)
  • Muscle contraction
  • Maintain a constant body temperature (in animals)

4. Which change does NOT take place during exercise?

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

5. What is Oxygen debt?

  • The amount of Oxygen needed to normalise the Oxygen levels in the blood after exercise
  • 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


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