BI-2235
The breathing system
Biology · Secondary 4 · Hard · The breathing system
A student models breathing using a bell jar, a rubber sheet at the bottom, and a balloon attached to a tube at the top. When the rubber sheet is pushed upwards, what happens to the air pressure inside the jar, the volume of the balloon, and the direction of air flow in the tube?
- air pressure increases, balloon volume decreases, air passes out
- air pressure increases, balloon volume increases, air passes in
- air pressure decreases, balloon volume increases, air passes out
- air pressure decreases, balloon volume decreases, air passes in
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