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Learning objective

Define (HT only) oxygen debt as the extra oxygen needed after exercise to react with accumulated lactic acid and remove it from cells.

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Topic

Respiration

Subtopic

Response to exercise

Aqa Gcse BiologyBioenergetics

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Quick explanation

Define (HT only) oxygen debt as the extra oxygen needed after exercise to react with accumulated lactic acid and remove it from cells

  • This point belongs to Respiration, especially Response to exercise.
  • You need to be able to define (HT only) oxygen debt as the extra oxygen needed after exercise to react with accumulated lactic acid and remove it from cells.
  • The key ideas to know are lactic acid, exercise, and oxygen debt.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

lactic acidexerciseoxygen debt

Why it matters

This objective helps connect Response to exercise to exam-style questions, flashcards, and revision notes for Respiration.

Quick student answer

What is (HT only) oxygen debt?

Direct answer

In Biology, this page helps you answer questions about (HT only) oxygen debt within Respiration. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are oxygen debt and lactic acid.

Key terms

  • oxygen debt: The extra oxygen needed after exercise to react with accumulated lactic acid and remove it from cells.
  • lactic acid: A byproduct of anaerobic respiration that accumulates in muscles during intense exercise when oxygen is insufficient.

Common trap

Misunderstanding Oxygen Debt: Clarify that oxygen debt specifically refers to the additional oxygen needed after exercise to metabolize lactic acid that has built up in the muscles.

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