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 that includes the bronchi, bronchial system, and
Down
  1. 1. The virus that affects the nose, throat, and lungs.
  2. 2. The chest cold.
  3. 3. The system that interacts with the respiratory system.
  4. 6. The illness caused by over 200 viruses.
  5. 7. The most important organ.