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Question
The figure above shows a model of lungs using a pair of balloons and an elastic membrane attached to a bottle whose wide end has been removed. When the elastic membrane is pulled, the red balloons expand. The elastic membrane represents which part of the respiratory system?
The figure above shows a model of lungs using a pair of balloons and an elastic membrane attached to a bottle whose wide end has been removed. When the elastic membrane is pulled, the red balloons expand. The elastic membrane represents which part of the respiratory system?
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Solution
The correct option is D Diaphragm
- The elastic membrane represents the diaphragm. The lungs (represented by the balloons) expand when the diaphragm is pulled down.
- Pulling of diaphragm down increases the volume of the chest cavity, creating a low pressure. Thus, the outside air rushes into the lungs causing them to expand.
- The reverse happens when the diaphragm moves upwards towards the lungs. The volume of the chest cavity decreases and the air is pushed out of the lungs.
- In our body, the rib cage also moves to help us breathe, but this model is simplistic and only shows the diaphragm.
- The elastic membrane represents the diaphragm. The lungs (represented by the balloons) expand when the diaphragm is pulled down.
- Pulling of diaphragm down increases the volume of the chest cavity, creating a low pressure. Thus, the outside air rushes into the lungs causing them to expand.
- The reverse happens when the diaphragm moves upwards towards the lungs. The volume of the chest cavity decreases and the air is pushed out of the lungs.
- In our body, the rib cage also moves to help us breathe, but this model is simplistic and only shows the diaphragm.
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