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ATP-PC System

Learn how ATP-PC system provides immediate energy for high-intensity exercise lasting up to 10 seconds, its biochemical reactions, and transition to the Lactic Acid System.

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ATP-PC System

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  1. ATP-PC System

  2. ATP-PC System • In high intensity exercise longer than 2 seconds ATP is resynthesized using PC (stored in muscles) P C PC stores are limited so ATP can only be resynthesized in this way for upto 10 seconds High energy bond

  3. ATP-PC System • This process involves 2 immediate reactions which take place within the muscle cell sarcoplasm. • When PC is broken down energy is released: P C Energy

  4. ATP-PC System Same energy is then used to resynthesize ATP Energy ADP P ATP P C Enzyme responsible for the breakdown of PC is Creatine Kinase PC => P + C + Energy (Exothermic Reaction) Energy + ADP + P => ATP (Endothermic Reaction) Energy

  5. ATP-PC System • When energy produced by one reaction is used in another reaction it is known as a COUPLED REACTION. • Therefore the resynthesis of ATP using PC is a COUPLED REACTION • The breakdown of PC is ANAEROBIC.

  6. ATP-PC System • Which of the following activities use the ATP-PC system? (you must be able to justify your choice(s))

  7. ATP-PC System • Correct Answers: • Why? – because they all last less than 10 seconds • Wrong Answers: • Why? – Because they last longer than 10 seconds

  8. ATP-PC System • No Oxygen is used and no lactic acid is formed in this system – therefore it is also called the Alactic Anaerobic System • The main advantage of the ATP-PC system = it is a very immediate source of energy

  9. ATP-PC System • When hard exercise is longer than 10seconds (beyond ATP-PC threshold) and all PC is used up, ATP then has to be resynthesized by a different system – LACTIC ACID SYSTEM • Therefore the point at which we switch from the ATP-PC System to the Lactic Acid System is known as the ALACTIC-LACTIC THRESHOLD

  10. ATP-PC System - Training • Speed endurance and power athletes use anaerobic work in order to delay the onset of the Alactic-Lactic Threshold. • Anaerobic work causes biological adaptations that allow muscle cell sarcoplasm to contain more ATP and creatine so ATP-PC system provides energy for longer at the highest possible rate. • Some athletes use daily Creatine supplements to increase the total muscle creatine.

  11. Energy Systems Homework • Complete the Homework sheet for next lesson.

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