O-LevelBiologyCoordination & Response5090/11 · Oct/Nov 2013 · Q181 Mark

A person begins to smoke a cigarette at time X. The graph shows how their heart rate changes. Which substance in cigarette smoke is the main cause of the change in heart rate between 10 and 18 minutes?

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Acarbon monoxide

Bnicotine

Csmoke particles

Dtar

✓ Correct answer

B: nicotine

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2013 Paper 1 Variant 1, question 18.

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