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1. What is the ATP yield from the ATP-PC system.

2. What is the site of reaction?

3. What is the enzyme involved?

4. What is the threshold of the ATP-PC system?

5. What is the first stage of the coupled reaction?

6. What is the second stage of the coupled reaction?

7. Name an advantage of this system?

8. Name a disadvantage of this system?

9. What is the type of reaction?

10. Give an appropriate sporting example.

Lesson Outcome:

How does the lactic acid energy system provide the body with energy so that we analyse its characteristics & compare it with other energy systems.

An average time for the completion of an agility test is 17 seconds for males and 19 seconds for females.

Identify the two predominant energy systems that would be used by an average performer during the completion of the test.

Discuss the advantages and disadvantages of one of the systems.

Step One: Generate questions

1) Write down the questions exactly as they are said

2) Do not stop to discuss or answer the questions

3) Write down as many questions as you can

4) Statements should be rephrased as questions

Step three: Identify open and closed questions

Look at their lists and put an “O” by all of the open-ended questions (questions with many possible answers) and a “C” by questions that elicit one answer (a “yes/no” question or a question with a factual answer). Then change one of their open questions into a closed question and one closed question into an open question.

Step four: Prioritize questions

Groups select 3 questions from their list. It could be the three questions they find most interesting or important or the three questions that they think need to be addressed first.

Step five: Share questions

Groups present their questions, share why they selected these three.

Step six: Reflections:

Opportunity to reflect by posting the your response on Edmodo.

1.What did you learn about formulating questions?

2. About the content?

3. About their own priorities?

4. About working with others?

5. What challenges did you encounter?

6. How did they manage you challenges?

7. Which questions, from your own list or from another group’s list, would most like to pursue and then write about why they selected this question.

http://www.polleverywhere.com/free_text_polls/NjM0NzU3MDc1

(ii)

An average time for the completion of an agility test is 17 seconds for males and 19 seconds for females.

Identify the two predominant energy systems that would be used by an average performer during the completion of this test.

Discuss the advantages and disadvantages of one of the energy systems you have identified.

6 marks total

2 marks for identification of energy systems

1. ATP/PC/alactic/phosphogen

2.lactic acid/anaerobic glycolysis

4 marks for discussion of advantages and disadvantages

NB: Mark.one energy system only

(ATP/PC)(Advantages)

3. very quick/immediate resynthesis of ATP

4. PC stores are quickly replenished as soon as activity stops/50% in

30secs

5. anaerobic, so no need to wait for sufficient O2 to be in body

6. no fatiguing by-products

(Disadvantages)

7. only a limited supply of PC in muscles/enough for only 10 seconds of activity

8. PC stores can only be replenished in the presence of O2/during

recovery periods

9. limited resynthesis of ATP/only 1 ATP

(Lactic acid system)

(Advantages)

10. relatively quick/few reactions

11. anaerobic, so no need to wait for sufficient O2 to be in body

12. lactic acid can be converted back to liver glycogen/used as a fuel

by conversion back to pyruvic acid

13. can use this system to increase intensity during exercise eg. sprint

finish in 1500m

(Disadvantages)

14. build up of lactic acid that increases acidity of blood and muscles

15. this inhibits enzyme action (glycogen phosphorylase and PFK),

stopping further breakdown of glycogen

16. also affect pain receptors in nerve endings causing discomfort

17. to continue exercise intensity must be lowered or stopped

18. limited amount of energy is released from glycogen in the absence

of O2/enough to resynthesise 2ATP

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