respiratory system

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Across
  1. 3. smallest type of blood vessel
  2. 4. passageway that leads to back of mouth
  3. 6. membrane behind nose and mouth
  4. 7. oval shaped opening in skull
  5. 9. organ forming on passageway to lungs
  6. 10. pair of spongy organs
  7. 11. airway from larynx to bronchi
  8. 12. contracts upon inhalation
Down
  1. 1. microscopic hairs on cells
  2. 2. canal connected to throat and stomach
  3. 5. area of body between neck and abdomen
  4. 8. large airway that leads to lung