BI-1016
The breathing system
Biology · Secondary 3 · Medium · The breathing system
In a model of the human thorax, a rubber sheet at the bottom represents the diaphragm and balloons represent the lungs. When the rubber sheet is pulled down, what happens in the balloons?
- Their volume decreases as air leaves them.
- Their volume increases as air enters them.
- Their volume stays the same but pressure increases.
- Their volume stays the same but pressure decreases.
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