Biology · May / June 2020 · Paper 12 · Question 18
The graph shows changes in the volume of a person's lungs over a period of two minutes. [graph: volume of air in lungs / litres against time / minutes, with arrows X and Y] What could cause the change in the pattern of the graph between X and Y?
- Achanging from running to walking
- Bchanging from walking to running
- Cdecreased frequency of contractions of the internal intercostal muscles
- Ddecreased strength of contractions of the internal intercostal muscles
As printed in the paper
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Correct answer: B. changing from walking to running
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