The Respiratory System

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Across
  1. 4. The _____ sacs inside the bronchial tree make an exchange from oxygen into carbon dioxide.
  2. 5. The wind pipe.
  3. 8. The system containing the bronchi, bronchial tree, and lungs.
Down
  1. 1. The virus that affects the nose, throat, and lungs
  2. 2. A chest cold.
  3. 3. The system that interacts with the respiratory system.
  4. 6. The cold caused by over 200 viruses.
  5. 7. The most important organ.