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Investigation 7.3
Gas Exchange in the Lungs |
We just compared the inside of lungs to grape-like sacs. This still does not tell us how the oxygen gets out of the alveoli or "grape-like sacs" and into the circulatory system. |
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Discuss this with your group and see if you can come up with a way. Draw your idea on your whiteboard to share with the class. |
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Look at the models all the other groups have come up with. Are they different from the model your group drew? |
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In your lab book make a quick drawing below of your current idea about how oxygen gets from the alveoli into the blood. |
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Now that you have built a model of the basic structure of the inside of the lungs and have some ideas about how the oxygen gets into the blood, let's try to make a model using the grapes and some string. |
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Think about this as you look at the grapes and string: |
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- Cells need oxygen to conduct cellular respiration. How do they get this oxygen that is in the lungs?
- How does the oxygen inside the lungs get out to the cells?
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PROBLEM TO SOLVE: If we want to get the most air possible out of each alveoli and into the blood stream what would be the mechanism? |
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With your group make a model to show how the oxygenated blood gets out of the lungs. |
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Now in your lab book, draw you model of how oxygen moves out of the air sacs (alveoli) of the lungs to go to the cells of the body. |
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After you have made your model of the interaction between the circulatory system and the lungs, share it with the rest of the class. |
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