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  • 1. Lesson 2. Aerobic energy system. Aims: To revise the phosphocreatine system and lactic acid energy system. To know the key functional characteristic of the aerobic energy system. To understand the positive and negative aspects of this system.
  • 2. PC + Lactic acid energy system questions.
    • 1. Why is the phosphocreatine energy system a coupled reaction [1]?
    • Answer: because the energy produced in one reaction is used by another reaction.
    • 2.Write an equation showing the resynthesis of ATP using the phosphocreatine system [2].
    • Answer: PC=P+C+ENERGY (exothermic)
    • ENERGY+ADP+P=ATP (endo)
  • 3. 3. Describe 2 advantages and 2 disadvantages of the phosphocreatine energy system [4]. Provides energy for 10secs. No harmful by-products One mole of ATP is re-synthesised form one mole of PC. O2 is not required. Small amount stored in muscle cells. Provides ATP re-synthesis quickly. Disadvantage. Advantage.
  • 4. 4. Name the enzyme that initiates anaerobic glycolysis [1].
    • Answer: Phosphofructokinase (PFK).
    • 5. During anaerobic glycolysis how many ATP moles are re-synthesised? [1].
    • Answer: 2.
    • 6. What is the name of the acid which is eventually converted into lactic acid? [1].
    • Answer: Pyruvic acid.
    • 7. Pyruvic acid is converted into lactic acid by which enzyme? [1].
    • Answer: lactate dehydrogenase (LDH).
  • 5. 8. Name 2 advantages and 1disadvantage of the lactic acid energy system [3]. No delay due to the lack of O2 required. Lasts from 15-180 seconds.e.g. 400m ATP provided quickly. Lactic acid produced reduced blood pH making it more acidic preventing enzymes from functioning properly. Provides more ATP than PC system. Disadvantage. Advantage.
  • 6. The Aerobic energy system
    • This system requires O2 and Glycogen or fat to resynthesis ATP.
    • When would fat be used?
    • When O2 is readily available and the intensity of exercise is moderate , the pyruvic acid is moved to another set of chemical reactions instead of being converted into lactic acid .
    • This is the junction from using the lactic acid system and the aerobic system!!!!!!!!
    • What type of sporting activities use the aerobic energy system?
  • 7. The Kreb’s Cycle.
    • The pyruvic acid is taken by the enzyme acetyl CoA into the Kreb’s cycle in the mitochondria (matrix).
    Glycogen Pyruvic acid 2 ATP Lactic acid Kreb’s cycle sarcoplasm Mitochondria matrix 2 ATP 2CO2 Removed via lungs Acetyl CoA
  • 8. Electron transfer chain
    • N.B if fat is being used as an energy source it enters the Kreb’s cycle as fatty acids and beta oxidation occurs.
    • The hydrogen from the Kreb’s cycle enters the next series of reactions known as ETC.
    • This occurs in the mitochondria cristae.
    • Electrons are removed from hydrogen and passed down the electron chain providing 34moles of ATP .
    • Hydrogen combines with O2 to produce water which is expelled out of the body.
  • 9. The ETC. Krebs cycle Hydrogen ETC O2 H2O 34ATP Mitochondria matrix. Mitochondria cristae
  • 10. The advantages and disadvantages of the aerobic energy system. No harmful by-products. Cannot provide ATP at high intensity work levels. Activity can last hours. The system cannot re-synthesis ATP instantly because of the delay in O2 transportation. Large amount of ATP is re-synthesised 36-38 moles of ATP from one mole of glycogen. Disadvantages Advantages