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1. The respiratory system is made up of the trachea, the lungs, and the _____
2. When you breathe in air, you bring oxygen into your lungs and blow out ____
3. What is the name of the tiny air sacs in your lungs?
4. What are the main functions of the respiratory system?
5. What are the primary gases involved in respiration?
6. Which of these is a common respiratory disease?