The person is pulling a rubber sheet downwards in the first case and pushing it up in the second. What structure in the human body is represented by the rubber sheet?
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A lung model can be used to demonstrate the process of breathing. The balloons represent the lungs, the glass jar represents the thorax and a rubber sheet represents the diaphragm . When the diaphragm (rubber sheet) moves down, the volume inside the glass jar (thorax) increases.
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