Glucose-Alanine Cycle Pyruvate Recycling

The video explains the glucose-alanine cycle, comparing it to the Cori cycle. While both cycles involve the conversion of glucose to pyruvate, the glucose-alanine cycle uses alanine instead of lactate. In the muscle, pyruvate is converted to alanine, which travels to the liver and is converted back to pyruvate and then glucose. This cycle is more prevalent under aerobic conditions, whereas the Cori cycle is used in anaerobic conditions.

What is the primary difference between the glucose-alanine cycle and the Cori cycle?

• The Cori cycle uses alanine.

• Both cycles use the same molecules.

• The glucose-alanine cycle uses lactate.

• The glucose-alanine cycle uses alanine.

In the glucose-alanine cycle, what is the role of alanine transaminase in the muscle?

• It converts glucose to alanine.

• It converts alanine to lactate.

• It converts pyruvate to alanine.

• It converts glucose to pyruvate.

What happens to alanine once it reaches the liver in the glucose-alanine cycle?

• It is stored as fat.

• It is used to form proteins.

• It is converted back to pyruvate.

• It is converted to lactate.

Under what conditions is the glucose-alanine cycle more likely to be used?

• Anaerobic conditions

• Aerobic conditions

• High-intensity exercise

• During fasting

Which cycle is more prevalent under anaerobic conditions?

• Neither cycle

• Glucose-alanine cycle

• Cori cycle

• Both cycles equally