Which enzyme controls the ATP-PC system, and what activates it?

Creatine kinase controls the breakdown of phosphocreatine. A rise in ADP levels as ATP is used activates the enzyme.

Describe the reactions of the ATP-PC system.

Phosphocreatine is broken down into phosphate and creatine, releasing energy. The energy is used in a coupled reaction to resynthesise ATP from ADP + P.

What is the ATP yield of the ATP-PC system?

The ATP-PC system resynthesises one molecule of ATP for every molecule of phosphocreatine broken down.

OCR A-Level Physical Education H555

Skeletal and Muscular Systems

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Energy for Exercise

The ATP-PC system

3 things to know
Component 01

Overview

The anaerobic ATP-PC system in the sarcoplasm, phosphocreatine as fuel, creatine kinase and its trigger, the coupled reaction and its one-to-one ATP yield, its duration at maximal intensity, and the weightlifter and high jumper.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

Is the ATP-PC system aerobic or anaerobic?

Key term

What is the fuel for the ATP-PC system?

Key term

Where does the ATP-PC system take place?

Questions from this subtopic

Each one with the model answer underneath.

1
Is the ATP-PC system aerobic or anaerobic?
Model answer
The ATP-PC system is anaerobic, so it does not need oxygen.
2
What is the fuel for the ATP-PC system?
Model answer
Phosphocreatine (PC), a high-energy compound stored in the muscle, is the fuel for the ATP-PC system.
3
Where does the ATP-PC system take place?
Model answer
The ATP-PC system takes place in the sarcoplasm of the muscle cell.
4
Which enzyme controls the ATP-PC system, and what activates it?
Model answer
Creatine kinase controls the breakdown of phosphocreatine. A rise in ADP levels as ATP is used activates the enzyme.
5
Describe the reactions of the ATP-PC system.
Model answer
Phosphocreatine is broken down into phosphate and creatine, releasing energy. The energy is used in a coupled reaction to resynthesise ATP from ADP + P.
6
What is the ATP yield of the ATP-PC system?
Model answer
The ATP-PC system resynthesises one molecule of ATP for every molecule of phosphocreatine broken down.

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