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A student uses a spirometer to measure the volume of air exhaled during three normal breaths.
| Breath | Volume of air exhaled / dm³ |
|---|---|
| 1 | 0.46 |
| 2 | 0.50 |
| 3 | 0.54 |
Determine the mean tidal volume.
State one change in the diaphragm during inspiration.
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