Page 15 - 新思维科学活动用书8 样章

1 Respiration

Exercise 1.3C Lung volume at different ages

Challenge

In this task, you will practise finding information on a graph.
You will do a simple calculation, and use evidence from the graph to make predictions.

Scientists measured the lung volumes of several hundred men and women of different ages. The
people were asked to push out as much air from their lungs as they could, in one breath.
The mean values of the volume of air pushed out for each age group were calculated.
The graph shows the results.

5.0

men
4.0

Mean volume of air
pushed out with
one breath in dm 3 3.0 women

2.0

1.0
5–9 10–19 20–29 30–39 40–49 50–59 60–69 70–79
Age group in years

1 Suggest why the researchers collected results from several hundred men and women, rather than
just a few in each age group.

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