Senior Secondary (HKDSE) · Physical Education

Energy System : Practice Questions

5 multiple-choice questions marked as you go, and 4 written questions with worked solutions. All on Energy System .

9 questions21 marksFree, no account

Question 1

1 mark

Which energy system is the primary source of energy for a short, explosive burst of physical activity lasting less than \( 10 \) seconds, such as a 100-metre sprint?

Question 2

1 mark

In the aerobic system, what is the net yield of ATP molecules produced through the complete oxidation of one molecule of glycogen in skeletal muscle?

Question 3

1 mark

Which of the following statements regarding the alactacid component of Excess Post-exercise Oxygen Consumption (EPOC) is correct?

Question 4

1 mark

Which of the following substances is the primary fuel source used by the ATP-CP system to resynthesize ATP during short, explosive physical activities?

Question 5

1 mark

In which part of the muscle fiber do the chemical reactions for the ATP-CP system and the Lactic Acid system take place?

Question 6

2 marks

Which energy system is primarily responsible for providing ATP during a high-intensity 100-meter sprint lasting approximately 10 seconds?

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Question 7

5 marks

Compare the Lactic Acid system and the Aerobic system regarding their primary limiting factors and the net yield of \(\text{ATP}\) produced from one molecule of glucose.

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Question 8

2 marks

During high-intensity exercise, the body relies on different energy pathways to resynthesize ATP.
(a) Identify the primary fuel source used in the Lactic Acid System (anaerobic glycolysis).
(b) Name the by-product of this system that is associated with a decrease in muscle pH and subsequent muscular fatigue.

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Question 9

7 marks

Analyze the energy continuum for an athlete competing in a 400m sprint lasting approximately 50 seconds. (a) Using the provided graph of energy system contributions, explain why the Lactic Acid system becomes the dominant energy provider after the first 10 seconds. (b) Discuss the physiological components of the alactic phase of recovery during EPOC (Excess Post-exercise Oxygen Consumption).

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