In the breathing model using a plastic bottle and balloons, pulling on the bottom balloon causes the balloon inside the bottle to inflate. This demonstrates the principle that:
1 )
Lungs expand when external pressure is applied
Increasing the volume of the chest cavity decreases air pressure, allowing air to flow into the lungs
3 )
The diaphragm pushes air directly into the lungs during inhalation
4 )
The windpipe expands during breathing in
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