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O-LevelBiologyRespiration5090/12 · Oct/Nov 2018 · Q171 Mark

How does anaerobic respiration in muscle cells cause a reduction in blood pH?

ACarbon dioxide, from anaerobic respiration, dissolves in the blood.
BEthanol produced by cell respiration diffuses into the blood.
CLactic acid diffuses into the blood.
DOxygen is removed from the blood supplying the muscle cells.

✓ Correct answer

C: Lactic acid diffuses into the blood.

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About this question

Topic
Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source
O-Level Biology, Oct/Nov 2018 Paper 1 Variant 2, question 17.

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