Energy Systems-Aerobic System

Question 1

Describe the stages of the aerobic system
(Give the energy yield at each stage)

Answer 1

1.Gloycolysis
glycogen is broken down into energy and pyruvic acid and if there is sufficient oxygen the pyruvic acid is converted into Acetyl CoA (2 ATP)

2.Krebs cycle
Acetyl CoA is carried by citric acid, and is then broken down into hydrogen, carbon dioxide and energy (2 ATP) and the hydrogen electrons are fed into the next stage

3.Electron transport chain
The hydrogen ions are oxidised to from water and energy (34 ATP)

Question 2

Where in the body do each of the following occur:
Glycolysis
Krebs Cycle
Electron Transport Chain

Answer 2

Glycolysis: Sarcoplasm
Krebs Cycle and ETC: Mitochondria

Question 3

Advantages of the aerobic system

Answer 3

No fatiguing bi-products
High energy yield (36-38ATP)
Long duration

Question 4

Disadvantages of the aerobic system

Answer 4

Low/moderate intensity exercise
Delay for oxygen delivery

Question 5

What is the enzyme that breaks glycogen into pyruvic acid

Answer 5

Phosphofructokinase