SSCE HSC Personal Development and Physical Education Acquiring skills: Compare the two anaerobic energy

Compare the two anaerobic energy systems. - HSC - SSCE Personal Development and Physical Education - Question 27 - 2014 - Paper 1

Question 27

Compare the two anaerobic energy systems.

Worked Solution & Example Answer:Compare the two anaerobic energy systems. - HSC - SSCE Personal Development and Physical Education - Question 27 - 2014 - Paper 1

Step 1

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Answer

The two main anaerobic energy systems are the phosphagen (or ATP-PC) system and the anaerobic glycolysis system.

Phosphagen System: This system utilizes stored ATP and creatine phosphate (CP) for rapid energy release. It is dominant in short bursts of high-intensity activity lasting up to 10 seconds.
- Source of Fuel: Utilizes stored ATP and creatine phosphate.
- Efficiency of ATP Production: Produces ATP quickly but in limited amounts.
- Duration: Operates for about 10 seconds; very short duration of energy release.
Anaerobic Glycolysis System: This system breaks down glucose for energy without the use of oxygen, producing ATP and by-products such as lactic acid. It is effective for moderate to high-intensity efforts lasting around 30 seconds to 2 minutes.
- Source of Fuel: Uses glucose from glycogen stores.
- Efficiency of ATP Production: Produces ATP at a faster rate compared to aerobic processes but generates lactic acid as a by-product.
- Duration: Can sustain energy production for up to 2 minutes but results in fatigue due to lactic acid accumulation.

Step 2

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Answer

Energy Output Duration: The phosphagen system provides immediate energy for high-intensity efforts up to 10 seconds, while the anaerobic glycolysis system supports activities for a longer duration of about 30 seconds to 2 minutes.
Fuel Source: The phosphagen system relies on stored ATP and CP, whereas anaerobic glycolysis uses glucose.
By-products: The phosphagen system does not produce by-products that cause fatigue, while anaerobic glycolysis produces lactic acid, which contributes to muscle fatigue.
ATP Production Rate: The phosphagen system produces ATP rapidly but in limited quantities, while anaerobic glycolysis generates ATP at a slower rate but can sustain it longer.