A-LevelBiologyTransport in mammalsFeb/Mar 2021Paper 1 Q351 Mark
The heart rate of a person at rest was recorded at intervals over two 15-minute periods. During the first five minutes of the second 15-minute period, the person smoked a cigarette. The graph shows the results recorded during the two 15-minute periods. [Graph showing heart rate /beats per min vs time/mins, with lines for 'smoking for first five minutes' and 'not smoking'] What can be concluded from the graph?
ACarbon monoxide affects the heart rate.
BCarbon monoxide binds to haemoglobin increasing the flow of blood.
CNicotine increases the heart rate so is a stimulant.
DThe heart rate increases as a result of smoking.
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The correct answer is D. This question tests the candidate's understanding of transport in mammals within the Biologysyllabus. The examiner's mark scheme requires...
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