Energy for Exercise | OCR A-Level Physical Education (H555)
Energy for Exercise
- 87 questions
- 6 subtopics
- Component 01: Physiological factors affecting performance
- Component 01
Energy for Exercise is examined in Component 01, Physiological factors affecting performance.
It covers ATP and coupled reactions, the ATP-PC system, the glycolytic system, the aerobic system, the energy continuum and intermittent exercise and EPOC and the recovery process.
Sample questions from Energy for Exercise
Answer each one closed book first, then open the answer.
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ATP and coupled reactions
How many phosphate groups does ADP contain?
Show the answer
ADP, adenosine diphosphate, contains two phosphate groups. ADP forms when ATP loses one phosphate. -
ATP and coupled reactions
What is needed to resynthesise ATP from ADP and phosphate?
Show the answer
Energy is needed to rejoin the phosphate to ADP. The energy comes from phosphocreatine or from food fuels such as glycogen and fat. -
The ATP-PC system
Describe the reactions of the ATP-PC system.
Show the answer
Phosphocreatine is broken down into phosphate and creatine, releasing energy. The energy is used in a coupled reaction to resynthesise ATP from ADP + P. -
The ATP-PC system
Name two disadvantages of the ATP-PC system.
Show the answer
The ATP-PC system yields only one ATP per molecule of phosphocreatine. Muscle phosphocreatine stores are small and run out within about 10 seconds. -
The glycolytic system
Describe the stages of the glycolytic system.
Show the answer
Glycogen is converted to glucose, which glycolysis breaks down to pyruvic acid. Pyruvic acid is then converted to lactic acid because oxygen is not available. -
The glycolytic system
Name two advantages of the glycolytic system.
Show the answer
The glycolytic system resynthesises ATP quickly because it needs few chemical reactions. The system can supply energy for longer than the ATP-PC system. -
The aerobic system
What happens in the electron transport chain?
Show the answer
Hydrogen is carried by NAD and FAD to the electron transport chain. The hydrogen ions and electrons combine with oxygen to form water, producing 34 ATP. -
The aerobic system
Why is fat the main fuel at rest and in low-intensity exercise?
Show the answer
Oxygen supply easily meets demand at low intensities. The body spares its limited glycogen and draws on its large fat stores.
The 6 subtopics
One subtopic is one session. Work down the list.
| Subtopic | What it covers | Questions |
|---|---|---|
| ATP and coupled reactions | ATP as the energy currency, ATPase and the breakdown equation, ADP, exothermic breakdown and endothermic resynthesis, how long muscle ATP stores last, energetically coupled reactions and the three energy systems. | 13 |
| The ATP-PC system | The anaerobic ATP-PC system in the sarcoplasm, phosphocreatine as fuel, creatine kinase and its trigger, the coupled reaction and its one-to-one ATP yield, its duration at maximal intensity, and the weightlifter and high jumper. | 13 |
| The glycolytic system | Anaerobic glycolysis in the sarcoplasm, glycogen phosphorylase, phosphofructokinase, lactate dehydrogenase, the two ATP yield, lactic acid and fatigue, how long the system predominates, and why it dominates a 400 m race. | 14 |
| The aerobic system | Glucose and fat as fuels, pyruvic acid and coenzyme A, the Krebs cycle and electron transport chain in the mitochondria, the total ATP yield, carbon dioxide and water, beta oxidation of fat, fuel use by intensity, and hitting the wall. | 15 |
| The energy continuum and intermittent exercise | The energy continuum and thresholds, intensity and duration, the 1500 m and the 100 m, reading energy system charts and tables, the interplay in netball and tennis, recovery periods, OBLA and fitness level. | 16 |
| EPOC and the recovery process | EPOC and the oxygen deficit, the fast component restoring phosphocreatine and myoglobin oxygen stores, the slow component with elevated circulation, ventilation and body temperature and lactate removal, active recovery and planning rest periods. | 16 |
How the guide is worked
Answering a question from memory stores it far better than reading the answer again. The guide runs that as a fixed procedure on one subtopic at a time, about twenty minutes a session.
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Step 1 · Closed book
Cover the answers. Work through one subtopic and write down what you can. Leave blanks where you have nothing.
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Step 2 · Open book
Go back to the top. Read each printed answer and write it out in full, including the ones you had right.
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Step 3 · Closed book again
Same questions, same order, from memory. The gap between pass one and pass three is the session result.
Read the full method, the return schedule and the research behind it.
Nearby topics
OCR A-Level Physical Education Active Recall Guide
Every topic, not just this one. 2,133 questions with their answers.