Respiratory System parts

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Across
  1. 2. The fine tubes ending in alveoli
  2. 4. Air enters here
  3. 6. The chest cavity reduces in size for this
  4. 8. How thick the alveoli are
  5. 10. Moves from alveoli to blood
  6. 11. Gases moving from a high to low concentration
  7. 12. Gas exchange happen here
  8. 13. Branch into each lung
  9. 14. Contracts and moves down when inhaling
Down
  1. 1. Carries air from the mouth to the bronchi
  2. 3. The location of alveoli
  3. 5. Moves from blood to alveoli
  4. 7. Helps gases diffuse
  5. 9. Very small blood vessel