What is the Phosphocreatine System - Mock Questions

What is the phosphocreatine system?

📣 Q: The phosphocreatine system is the main contributor of energy when performing

🧐 Level 2 + 3 Anatomy & Physiology Mock Question 🧐

📣 Q: The phosphocreatine system is the main contributor of energy when performing

👉a. an exercise for muscular endurance
👉b. acceleration sprints
👉c. moderate cycling
👉d. a long-distance run

What’s the CORRECT answer? Go…

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Answer

The Correct Answer is B = acceleration sprints

Find out why, by reading the rest of the blog below...

All movement requires energy.

The methods by which the body generates energy are determined by the intensity and duration of the activity being undertaken.

Activities that require short bursts of effort, such as acceleration sprints, require the body to produce large amounts of energy over a short period. Whereas activities like long-distance running or endurance cycling require continued energy production over a longer period and at a slower rate. It is the energy systems of your body that facilitate these processes.

Here’s a previous blog and video tutorial that explains all 3 energy systems in greater depth:  What are the three energy systems?

In short…

Energy is required in order to make the muscle fibres contract. This energy is obtained from the oxidation of foods in the diet, particularly carbohydrate and fat.

When these substances are burned in the muscle cells, ATP is formed, which is rich in energy. When ATP is broken down, it gives energy for muscle contraction. It is the only molecule that can supply the energy used in the contraction of muscle fibres and can be made in three ways: the creatine phosphate system which is also called Phosphocreatine, the lactic acid energy system and the aerobic energy system.

ATP is kinda like petrol for a car. A petrol car can only use petrol to make the engine work and perform – ATP is the petrol of the human body!

Phosphocreatine energy system

ATP and creatine phosphate (or phosphocreatine, or PCr) make up the ATP-PCr system.

It is the immediate energy system, therefore this system is used when standing up out of a chair for 1 rep all the way through to the first 10 seconds of explosive sudden movement. The Creatine phosphate or Phosphocreatine system (PCr) is a high-energy compound. When exercise intensity is high, or energy needs are instantaneous, creatine phosphate stored in muscle is broken down to provide energy to make ATP. When the high-energy bond in PCr is broken, the energy it releases is used to resynthesise ATP.

In this process, ATP is usually made without the presence of oxygen <<< WITHOUT OXYGEN

Explosive work can be achieved, but only for short periods (up to about 10 seconds) at maximum intensity, as the supply of PCr is very limited.

Learn about the other 2 energy systems here: What are the three energy systems?

In summary

  • The methods by which the body generates energy are determined by the intensity and duration of the activity being undertaken.
  • Energy is required in order to make the muscle fibres contract.
  • Energy is obtained from the oxidation of foods in the diet, particularly carbohydrate and fat.
  • ATP and creatine phosphate (or phosphocreatine, or PCr) make up the ATP-PCr system.
  • The Creatine phosphate (PCr) system is a high-energy compound and ATP is usually made without the presence of oxygen.
  • Explosive work such as acceleration sprints can be achieved, but only for short periods (up to about 10 seconds) at maximum intensity.
  • Here’s what Carly had to say about the A&P Revision Mastery Bootcamp 👇 👇 👇

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