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.
What can be concluded from the graph?
1 )
Carbon monoxide affects the heart rate.
2 )
Carbon monoxide binds to haemoglobin increasing the flow of blood.
3 )
Nicotine increases the heart rate so is a stimulant.
The heart rate increases as a result of smoking.
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