The Respiratory System

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Across
  1. 2. What happens to the diaphragm when we breathe in?
  2. 5. What structure helps the lungs to breathe in and out?
  3. 7. What does the trachea divide into?
  4. 8. How many lobes does the right lung have?
  5. 9. What structure permits air exchange?
  6. 10. What gets exchanged for carbon dioxide in the pulmonary capillaries?
Down
  1. 1. What happens to the chest during inspiration?
  2. 3. What is the pipe-like structure surrounded by cartilaginous rings?
  3. 4. Which lung is smaller to allow space for the heart?
  4. 6. What structure protects the lungs?