Energy systems (BTEC Sport)
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the primary function of the ATP-PC energy system in the body?
✔✔To provide immediate energy for high-intensity, short-duration activities.
During which type of activity is the ATP-PC system most dominant?
✔✔Sprinting or heavy lifting lasting up to 10 seconds.
What molecule is broken down in the ATP-PC system to quickly regenerate ATP?
✔✔Phosphocreatine (PC).
How long does it typically take to fully replenish phosphocreatine stores after maximal effort?
✔✔Approximately 2 to 5 minutes.
Which energy system provides energy for activities lasting from 10 seconds to 2 minutes?
✔✔Anaerobic glycolysis (lactic acid system).
What is the main fuel source for anaerobic glycolysis?
✔✔Glucose.
What byproduct accumulates during anaerobic glycolysis, causing muscle fatigue?
1
,✔✔Lactic acid.
Why is anaerobic glycolysis called the lactic acid system?
✔✔Because it produces lactic acid as a byproduct of glucose breakdown without oxygen.
Which energy system dominates in activities lasting longer than 2 minutes?
✔✔Aerobic system.
What fuels the aerobic energy system?
✔✔Carbohydrates, fats, and sometimes proteins.
What is the main byproduct of aerobic respiration?
✔✔Carbon dioxide and water.
How many ATP molecules are produced from one glucose molecule in aerobic respiration?
✔✔Approximately 36 to 38 ATP.
Which system is used during a 100-meter sprint?
✔✔ATP-PC system.
Which energy system is most active during a 400-meter run?
✔✔Anaerobic glycolysis system.
2
, During a marathon, which energy system is primarily used?
✔✔Aerobic system.
Why is oxygen important in the aerobic energy system?
✔✔It is required for the complete breakdown of glucose and fats to produce ATP.
How does the body store ATP?
✔✔In small amounts within the muscles, enough for a few seconds of activity.
Which energy system allows rapid regeneration of ATP without oxygen?
✔✔ATP-PC system.
Which energy system produces the most total ATP?
✔✔Aerobic system.
How does lactic acid affect muscle performance?
✔✔It lowers pH in muscles, causing fatigue and discomfort.
Which system is most efficient for long-duration, low-intensity exercise?
✔✔Aerobic system.
3
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the primary function of the ATP-PC energy system in the body?
✔✔To provide immediate energy for high-intensity, short-duration activities.
During which type of activity is the ATP-PC system most dominant?
✔✔Sprinting or heavy lifting lasting up to 10 seconds.
What molecule is broken down in the ATP-PC system to quickly regenerate ATP?
✔✔Phosphocreatine (PC).
How long does it typically take to fully replenish phosphocreatine stores after maximal effort?
✔✔Approximately 2 to 5 minutes.
Which energy system provides energy for activities lasting from 10 seconds to 2 minutes?
✔✔Anaerobic glycolysis (lactic acid system).
What is the main fuel source for anaerobic glycolysis?
✔✔Glucose.
What byproduct accumulates during anaerobic glycolysis, causing muscle fatigue?
1
,✔✔Lactic acid.
Why is anaerobic glycolysis called the lactic acid system?
✔✔Because it produces lactic acid as a byproduct of glucose breakdown without oxygen.
Which energy system dominates in activities lasting longer than 2 minutes?
✔✔Aerobic system.
What fuels the aerobic energy system?
✔✔Carbohydrates, fats, and sometimes proteins.
What is the main byproduct of aerobic respiration?
✔✔Carbon dioxide and water.
How many ATP molecules are produced from one glucose molecule in aerobic respiration?
✔✔Approximately 36 to 38 ATP.
Which system is used during a 100-meter sprint?
✔✔ATP-PC system.
Which energy system is most active during a 400-meter run?
✔✔Anaerobic glycolysis system.
2
, During a marathon, which energy system is primarily used?
✔✔Aerobic system.
Why is oxygen important in the aerobic energy system?
✔✔It is required for the complete breakdown of glucose and fats to produce ATP.
How does the body store ATP?
✔✔In small amounts within the muscles, enough for a few seconds of activity.
Which energy system allows rapid regeneration of ATP without oxygen?
✔✔ATP-PC system.
Which energy system produces the most total ATP?
✔✔Aerobic system.
How does lactic acid affect muscle performance?
✔✔It lowers pH in muscles, causing fatigue and discomfort.
Which system is most efficient for long-duration, low-intensity exercise?
✔✔Aerobic system.
3
