Respiratory system

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Across
  1. 2. – Voice box
  2. 3. – Windpipe
  3. 5. – Muscle below lungs aiding breathing
  4. 6. – Flap that prevents food entering windpipe
  5. 9. – Tiny air sacs for gas exchange
  6. 10. – Separates chest from abdomen
  7. 11. – Membrane around lungs
  8. 13. – Air tube to lungs
  9. 15. – Gas inhaled
  10. 17. – Openings in the nose
  11. 19. CAVITY – Space housing lungs
  12. 20. – Smallest lung branches
Down
  1. 1. – Tiny nasal hairs that filter dust
  2. 4. DIOXIDE – Gas exhaled
  3. 7. – Process of drawing in air
  4. 8. – Dome-shaped breathing muscle
  5. 12. – Organs of respiration
  6. 14. SYSTEM – Gas-exchange system
  7. 16. – Movement of air in and out
  8. 18. – Two main tubes into lungs