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37�3 The Respiratory System
 
1.  Key Concept Interpret the function of the respiratory system by stating what it does.
2.  Key Concept Describe some of the health problems caused by smoking tobacco.
3. Explain the process of gas exchange in the lungs.
4. Describe how breathing is controlled.
5. Critical Thinking Inferring As you have read, the breathing center in the brain responds to the level of carbon dioxide in the blood—not the level of oxygen. What consequences does this have for people at high altitudes?


Comparative Anatomy

Compare what you learned in Units 8 and 9 about respiration in terrestrial arthropods, fish, and flatworms with human respiration. Relate the method of respiration to the type of environment the organism inhabits. What do these methods have in common? How do they differ?
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