A-Level PE - Energy Systems Questions
and Answers Latest Version Already
Passed
What is the primary source of energy for high-intensity, short-duration activities like sprinting?
✔✔The ATP-PC system provides immediate energy for high-intensity, short-duration activities.
How does the body replenish ATP during extended exercise?
✔✔ATP is replenished through the breakdown of carbohydrates, fats, and proteins, primarily
using the aerobic energy system.
What is the role of creatine phosphate (PC) in energy production?
✔✔Creatine phosphate is broken down to quickly regenerate ATP during short bursts of high-
intensity activity.
Why is oxygen essential for the aerobic energy system?
✔✔Oxygen is needed to break down carbohydrates and fats efficiently to produce energy during
prolonged activities.
1
,What is the by-product of anaerobic glycolysis?
✔✔Lactic acid is the by-product of anaerobic glycolysis.
How does the body clear lactic acid after exercise?
✔✔Lactic acid is cleared through oxidation, where it is converted back to pyruvate or used for
energy.
What energy system is primarily used during a marathon?
✔✔The aerobic energy system is the primary energy source during a marathon.
Why does fatigue occur during anaerobic activities?
✔✔Fatigue occurs due to the accumulation of lactic acid and the depletion of creatine phosphate.
What is the main fuel source for the aerobic energy system?
✔✔The aerobic energy system primarily uses carbohydrates and fats as fuel sources.
How is energy produced in the anaerobic glycolytic system?
2
,✔✔Energy is produced through the breakdown of glucose without oxygen, resulting in ATP and
lactic acid.
What happens during EPOC (Excess Post-Exercise Oxygen Consumption)?
✔✔EPOC helps the body restore ATP, remove lactic acid, and return to pre-exercise conditions.
Why is the ATP-PC system not sustainable for prolonged activity?
✔✔The ATP-PC system depletes quickly, as the stores of creatine phosphate are limited.
What causes the burning sensation in muscles during intense exercise?
✔✔The burning sensation is caused by the accumulation of hydrogen ions from lactic acid.
What is the predominant energy system used in a 400m sprint?
✔✔The anaerobic glycolytic system is predominantly used in a 400m sprint.
How do carbohydrates provide energy during exercise?
✔✔Carbohydrates are broken down into glucose and glycogen, which are used in both aerobic
and anaerobic energy systems.
3
, Why is fat a more efficient fuel source for long-duration activities?
✔✔Fat provides more ATP per molecule compared to carbohydrates but requires more oxygen
to metabolize.
What is the main limiting factor of the aerobic energy system?
✔✔The availability of oxygen is the main limiting factor of the aerobic energy system.
How does the intensity of exercise affect the energy system used?
✔✔Higher-intensity exercise relies on anaerobic systems, while lower-intensity, prolonged
exercise uses the aerobic system.
What happens when glycogen stores are depleted during exercise?
✔✔The body shifts to using fats as the primary fuel source, which reduces exercise intensity.
Why is the recovery period important after high-intensity exercise?
✔✔The recovery period allows ATP and creatine phosphate levels to replenish and lactic acid to
clear.
4
and Answers Latest Version Already
Passed
What is the primary source of energy for high-intensity, short-duration activities like sprinting?
✔✔The ATP-PC system provides immediate energy for high-intensity, short-duration activities.
How does the body replenish ATP during extended exercise?
✔✔ATP is replenished through the breakdown of carbohydrates, fats, and proteins, primarily
using the aerobic energy system.
What is the role of creatine phosphate (PC) in energy production?
✔✔Creatine phosphate is broken down to quickly regenerate ATP during short bursts of high-
intensity activity.
Why is oxygen essential for the aerobic energy system?
✔✔Oxygen is needed to break down carbohydrates and fats efficiently to produce energy during
prolonged activities.
1
,What is the by-product of anaerobic glycolysis?
✔✔Lactic acid is the by-product of anaerobic glycolysis.
How does the body clear lactic acid after exercise?
✔✔Lactic acid is cleared through oxidation, where it is converted back to pyruvate or used for
energy.
What energy system is primarily used during a marathon?
✔✔The aerobic energy system is the primary energy source during a marathon.
Why does fatigue occur during anaerobic activities?
✔✔Fatigue occurs due to the accumulation of lactic acid and the depletion of creatine phosphate.
What is the main fuel source for the aerobic energy system?
✔✔The aerobic energy system primarily uses carbohydrates and fats as fuel sources.
How is energy produced in the anaerobic glycolytic system?
2
,✔✔Energy is produced through the breakdown of glucose without oxygen, resulting in ATP and
lactic acid.
What happens during EPOC (Excess Post-Exercise Oxygen Consumption)?
✔✔EPOC helps the body restore ATP, remove lactic acid, and return to pre-exercise conditions.
Why is the ATP-PC system not sustainable for prolonged activity?
✔✔The ATP-PC system depletes quickly, as the stores of creatine phosphate are limited.
What causes the burning sensation in muscles during intense exercise?
✔✔The burning sensation is caused by the accumulation of hydrogen ions from lactic acid.
What is the predominant energy system used in a 400m sprint?
✔✔The anaerobic glycolytic system is predominantly used in a 400m sprint.
How do carbohydrates provide energy during exercise?
✔✔Carbohydrates are broken down into glucose and glycogen, which are used in both aerobic
and anaerobic energy systems.
3
, Why is fat a more efficient fuel source for long-duration activities?
✔✔Fat provides more ATP per molecule compared to carbohydrates but requires more oxygen
to metabolize.
What is the main limiting factor of the aerobic energy system?
✔✔The availability of oxygen is the main limiting factor of the aerobic energy system.
How does the intensity of exercise affect the energy system used?
✔✔Higher-intensity exercise relies on anaerobic systems, while lower-intensity, prolonged
exercise uses the aerobic system.
What happens when glycogen stores are depleted during exercise?
✔✔The body shifts to using fats as the primary fuel source, which reduces exercise intensity.
Why is the recovery period important after high-intensity exercise?
✔✔The recovery period allows ATP and creatine phosphate levels to replenish and lactic acid to
clear.
4
