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O-LevelBiologyRespiration5090/11 · Oct/Nov 2010 · Q161 Mark

The following changes take place in an athlete's body during a 100 m race. Which change occurs first?

Aincreased availability of oxygen to muscles
Bincreased breathing rate
Cincreased carbon dioxide concentration in the blood
Dincreased production of carbon dioxide by muscles

✓ Correct answer

D: increased production of carbon dioxide by muscles

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About this question

Topic
Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source
O-Level Biology, Oct/Nov 2010 Paper 1 Variant 1, question 16.

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