What happens to oxygen debt after anaerobic exercise is finished?

• A. Oxygen debt is repaid by holding the breath after exercise.
• B. The body reduces breathing rate to help recover faster.
• C. Oxygen debt is repaid by panting and gasping to take in more oxygen and remove CO2.
• D. Oxygen debt is paid completely during the exercise itself.

Answer: (C)

After intense, anaerobic work the body has an oxygen deficit because energy was produced without enough oxygen. When you finish, the need for oxygen remains high, and breathing stays elevated to repay that debt. This increased breathing, often described as panting or gasping, helps take in more oxygen and remove the CO2 produced by the previous anaerobic steps. It also supports processes like converting lactate back to usable molecules and replenishing energy stores so you can recover properly. So the debt is settled after exercise through rapid, deeper breathing rather than holding the breath, slowing down, or paying it off during the activity itself.