Respiratory System

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Across
  1. 4. In the back of the throat,First line of defense
  2. 5. exhalation
  3. 8. Roof of the mouth
  4. 9. Air flows into the lungs
  5. 12. chemical receptor cells that detect muscle contraction
  6. 13. muscular passageway
  7. 14. Conchae Three uneven,scroll-like nasal bones
  8. 15. Air come trough these two openings
Down
  1. 1. Gas exchange is done through this process
  2. 2. Phospholipid that reduces surface tension in the alveoli
  3. 3. Air sacs in the lungs
  4. 5. Top of the larynx is a flap of tissue
  5. 6. Windpipe
  6. 7. Air-filled cavities that surround the nose
  7. 10. lungs surrounded by thin double-walled
  8. 11. Thin-walled branches of the bronchi