Which enzyme controls glycolysis, and what activates it?

Phosphofructokinase (PFK) controls the breakdown of glucose to pyruvic acid. PFK is activated by a fall in phosphocreatine levels.

Describe the stages of the glycolytic system.

Glycogen is converted to glucose, which glycolysis breaks down to pyruvic acid. Pyruvic acid is then converted to lactic acid because oxygen is not available.

Which enzyme converts pyruvic acid to lactic acid?

Lactate dehydrogenase (LDH) converts pyruvic acid to lactic acid when oxygen is not available.

OCR A-Level Physical Education H555

Skeletal and Muscular Systems

Topic overview Shoulder, elbow and wrist joints and muscles Hip, knee and ankle joints and muscles Planes of movement, muscle roles and contractions Analysing movement in sporting actions Motor units and muscle fibre types

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Energy for Exercise

The glycolytic system

3 things to know
Component 01

Overview

Anaerobic glycolysis in the sarcoplasm, glycogen phosphorylase, phosphofructokinase, lactate dehydrogenase, the two ATP yield, lactic acid and fatigue, how long the system predominates, and why it dominates a 400 m race.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

Is the glycolytic system aerobic or anaerobic, and where does it take place?

Key term

What is the fuel for the glycolytic system?

Key term

Which enzyme breaks glycogen down to glucose?

Questions from this subtopic

Each one with the model answer underneath.

1
Is the glycolytic system aerobic or anaerobic, and where does it take place?
Model answer
The glycolytic system is anaerobic. The glycolytic system takes place in the sarcoplasm of the muscle cell.
2
What is the fuel for the glycolytic system?
Model answer
Glycogen, stored in the muscles and liver and broken down to glucose, is the fuel for the glycolytic system.
3
Which enzyme breaks glycogen down to glucose?
Model answer
Glycogen phosphorylase (GPP) breaks glycogen down to glucose.
4
Which enzyme controls glycolysis, and what activates it?
Model answer
Phosphofructokinase (PFK) controls the breakdown of glucose to pyruvic acid. PFK is activated by a fall in phosphocreatine levels.
5
Describe the stages of the glycolytic system.
Model answer
Glycogen is converted to glucose, which glycolysis breaks down to pyruvic acid. Pyruvic acid is then converted to lactic acid because oxygen is not available.
6
Which enzyme converts pyruvic acid to lactic acid?
Model answer
Lactate dehydrogenase (LDH) converts pyruvic acid to lactic acid when oxygen is not available.

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Energy for Exercise

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