PSE 4U
Energy Systems (Exercise Science pages 81 – 85)
1a) What are the common food sources for carbohydrates?
b) All carbohydrates are eventually assimilated into what common form?
c) What and where are carbohydrates stored as in humans?
2a) What is ATP? Sketch figure fig. 5.1 into your notes with the equation from p. 82 underneath it.
b) Think back to the Sliding Filament Theory – What is ATP used for during muscular contraction?
3a) Explain the difference between the terms aerobic and anaerobic energy production.
b) Although our bodies use both aerobic and anaerobic pathways to produce ATP, what factors determine
how much each pathway contributes to ATP production?
ATP-PC
1. How is ATP produced using this pathway?
2. What is another name for this pathway?
3. What type of activities/sports primarily use this pathway?
4. What is the limiting factor (disadvantage of this system)?
5. How long does it take to replenish phosphocreatine stores and when does this occur?
6. Copy the equation from p. 83 into your notes.
Anaerobic Glycolysis
1. During what timeframe does this pathway contribute heavily to ATP production?
2. What type of activities are largely dependent on this system?
3. What is the limiting factor of this pathway/system?
4. Explain the relationship between pyruvate and lactic acid. What factor determines whether your
muscles produce pyruvate or lactic acid?
5. What is “exercise recovery” and how can it help an athlete?
6. What is another name for this system?
Aerobic System
1. Where does aerobic energy production take place within the muscle cell?
2. What fuels can be used to produce ATP using this system/pathway?
3. What fuel is predominant after 20 minutes?
4. What type of activities are largely dependent on this system for energy production?
5. What are the waste products from this pathway?
Lactic Acid
1. What is anaerobic threshold or blood lactate threshold?
2. How can an athlete increase their blood lactate threshold?
3. Describe what is happening in the Cori Cycle.