The oxygen debt is repaid by

  1. breaking down lactic acid in the liver using oxygen
  2. making more lactic acid
  3. storing lactic acid in bones
  4. slowing breathing down
Answer

A) breaking down lactic acid in the liver using oxygen

Extra oxygen is used to break down lactic acid in the liver. O Level Biology · Topic 10 Respiration · 10.3 Anaerobic respiration

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