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Lesson 2. Aerobic energy system.

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. PC + Lactic acid energy system questions.

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Lesson 2. Aerobic energy system.

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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].

  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].

  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 2 ATP Pyruvic acid Lactic acid sarcoplasm Acetyl CoA Mitochondria matrix Kreb’s cycle 2CO2 Removed via lungs 2 ATP

  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 Mitochondria matrix. Mitochondria cristae Hydrogen O2 ETC 34ATP H2O

  10. The advantages and disadvantages of the aerobic energy system.

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