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CAIE IGCSE Biology 12.3.6 Lactic Acid Builds Up in Muscles Questions

Learn how vigorous exercise can limit oxygen supply to muscles, causing lactic acid to build up in muscles and blood and create an oxygen debt.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • Explain that vigorous exercise can exceed the oxygen supply to muscles, so anaerobic respiration produces lactic acid.
  • State that lactic acid builds up in muscles and blood during vigorous exercise, causing an oxygen debt.

CAIE IGCSE Biology 12.3.6 Lactic Acid Builds Up in Muscles Questions question 1

[Maximum number: 1]

During exercise an oxygen debt may occur in muscles.
What is the cause of this oxygen debt?

A

Aerobic respiration causes a decrease in lactic acid.

B

Aerobic respiration causes an increase in lactic acid.

C

Anaerobic respiration causes a decrease in lactic acid.

D

Anaerobic respiration causes an increase in lactic acid.

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