Across
- 2. pores of ___ that allow gases to move through the alveolar walls
- 3. clusters of lymphatic tissue in the pharynx that are the first line of defense against infection
- 8. a phospholipid that lines the alveoli and prevents them from collapsing
- 11. the structure made up of hard and soft components that separates the oral and nasal cavities
- 12. a flap of cartilaginous tissue that covers the opening to the trachea and diverts food and liquids to the esophagus
- 13. the two passageways that branch off the trachea and lead to the left and right lungs
- 15. another name for the voice box
- 16. the collective name for the respiratory and cardiovascular systems
- 17. air sacs in the lungs responsible for gas exchange
Down
- 1. another name for the throat
- 4. the air-filled cavities that surround the nose
- 5. three uneven, scroll-like nasal bones in the nasal cavity
- 6. concave area between the lungs that leaves room for the heart and other structures of the chest cavity
- 7. two small openings in the nose, another name for nostrils
- 9. the smallest air-conducting branches of the bronchi
- 10. double-walled sac surrounding the lungs
- 14. connects the larynx to the throat, another name for windpipe