Aerobic Energy System

Question 1

What are the two energy sources used by the aerobic energy system?

Answer 1

Glucose and Fats

Question 2

Explain the stages of the Krebs cycle

Answer 2

• Pyruvate + coA –> acetylcoA
• AcetylcoA oxidised
• Citrate formed and oxidised
• Hydrogen ions released and removed
• CO2 released and removed
• 2 ATP resynthesised

Question 3

Explain the ETC

Answer 3

• Hydrogen ions oxidised to form water
• 34 ATP produced

Question 4

What are some advantages of fat metabolism?

Answer 4

• Fat is available as an energy source to provide ATP
• Fat break down is aerobic
• Used during low intensity exercise
• Fat as insulator

Question 5

What are some disadvantages of fat metabolism?

Answer 5

• Cannot be used anaerobically
• Less efficient in energy yield per unit of oxygen
• Requires carbohydrate to run
• Slower breakdown and transport
• Fat can result in excess weight
• Health issues like diabetes and negative impact on components of fitness like poor flexibility

Question 6

How can fats be broken down to release energy?

Answer 6

• Glycolysis is replaced with beta oxidation
• Involves fatty acids being broken down to then combine with AcetylcoA to start the Krebs Cycle