This deep dive covers Oxygen Debt and Recovery within Respiration for GCSE Biology. Topic 2: Respiration It is section 4 of 14 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 4 of 14
Practice
15 questions
Recall
20 flashcards
🏃 Oxygen Debt and Recovery
After vigorous exercise, you continue to breathe heavily even though you've stopped moving. This is because your body has built up an oxygen debt — the extra oxygen needed to deal with the lactic acid produced during anaerobic respiration.
Here's what happens during recovery:
- Lactic acid is transported in the blood to the liver
- In the liver, lactic acid is converted back into glucose — this requires oxygen
- Your breathing rate and heart rate remain elevated to supply this extra oxygen
- Once the lactic acid is fully processed, breathing returns to normal
The liver is the key organ here — exam answers about oxygen debt that don't mention the liver typically lose a mark.