The Respiratory System

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Across
  1. 6. completes circular ring of cartilage in the upper airway
  2. 7. smaller sacs
  3. 8. passageway for air into the lungs
  4. 10. Transfer gases such as oxygen and carbon
  5. 13. Exchange of oxygen and carbon
  6. 14. when external respiration in occurs
  7. 15. separation of lungs
  8. 17. Process of breathing in air
  9. 18. Leaf like flop of tissue at the bottom of the larynx
Down
  1. 1. Enters lungs and breaks in two smaller tubes
  2. 2. Transfers oxygen to lungs to the tissue of the cell
  3. 3. known as an Adams apple
  4. 4. what is related to respiration
  5. 5. hollow spaces in the skull connects with nasal cavity
  6. 9. Physical act of breathing
  7. 11. Trachea branches into two tubes
  8. 12. process of breathing out air
  9. 16. located behind the nasal cavity