key term - Cori cycle

Definition

The Cori cycle is a metabolic pathway that describes the process by which lactate produced in muscles during anaerobic respiration is transported to the liver, converted back to glucose, and then returned to the muscles for energy use. This cycle plays a critical role in maintaining energy supply when oxygen levels are low, helping to prevent lactic acid accumulation and facilitating continued muscle function.

5 Must Know Facts For Your Next Test

1. The Cori cycle helps clear lactate from the muscles, reducing muscle fatigue during intense exercise.
2. Lactate produced in muscles during anaerobic conditions is sent to the liver, where it undergoes conversion back into glucose through gluconeogenesis.
3. This cycle is especially important during high-intensity activities where oxygen is limited and energy demand is high.
4. The Cori cycle can help maintain blood glucose levels during prolonged exercise, providing a continuous supply of energy to working muscles.
5. Understanding the Cori cycle is crucial for athletes and trainers as it highlights the importance of recovery and nutrition in sports performance.

Review Questions

• How does the Cori cycle contribute to energy metabolism during periods of low oxygen availability?
  • The Cori cycle plays a key role in energy metabolism during low oxygen availability by facilitating the recycling of lactate produced in muscles back into glucose. When muscles engage in anaerobic respiration, they generate lactate, which can lead to fatigue if not cleared. The Cori cycle allows this lactate to be transported to the liver where it's converted into glucose, which can then be returned to the muscles for continued energy production. This process ensures that muscles can sustain activity even when oxygen is scarce.
• Discuss the relationship between the Cori cycle and muscle fatigue during high-intensity exercise.
  • During high-intensity exercise, muscles rely heavily on anaerobic respiration due to insufficient oxygen, resulting in lactate accumulation and muscle fatigue. The Cori cycle mitigates this fatigue by transporting lactate from the muscles to the liver for conversion back into glucose. This not only helps clear excess lactate but also replenishes glucose stores, allowing for continued muscle performance. Therefore, understanding the Cori cycle is vital for managing fatigue and optimizing performance in athletes.
• Evaluate the implications of the Cori cycle on athletic training and recovery strategies.
  • The Cori cycle has significant implications for athletic training and recovery strategies as it highlights the need for effective management of lactate levels during exercise. By understanding how lactate is processed and recycled into glucose through the Cori cycle, athletes can develop training regimens that include active recovery techniques to enhance lactate clearance. Furthermore, post-exercise nutrition focusing on carbohydrates can aid gluconeogenesis in the liver, improving recovery time and performance in subsequent training sessions or competitions.

Related terms

Anaerobic respiration: A form of respiration that occurs without oxygen, producing energy through processes like glycolysis and resulting in byproducts such as lactate.

Lactate: A byproduct of anaerobic metabolism formed when glucose is broken down for energy without sufficient oxygen, often associated with muscle fatigue.

Gluconeogenesis:

The metabolic process through which glucose is synthesized from non-carbohydrate precursors, primarily occurring in the liver.