BI-2233
The breathing system
Biology · Secondary 4 · Hard · The breathing system
In an experiment, a student uses a bell jar model of the thorax. When the rubber sheet at the bottom is pulled down, what happens to the air pressure inside the jar, the volume of the balloon, and the direction of air flow in the tube?
- pressure increases, balloon volume increases, air flows out
- pressure increases, balloon volume decreases, air flows in
- pressure decreases, balloon volume increases, air flows in
- pressure decreases, balloon volume decreases, air flows out
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