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Directions: Read the question carefully, and choose the best answer.
1. Which of the following structures are small air sacs that function as the site of gas exchange in the lungs?
2. Which of the following conditions is caused by an immune response?
3. What does the diaphragm do during inspiration?
4. Which of the following is true about air in the lungs?
5. Which of the following does not have a sphincter?