Across
- 4. - air sacs in the lungs
- 5. - are the largest organs that occupy the chest cavity
- 10. - air enters into the nostrils or
- 12. - interior walls are cover in this substance
- 13. - Bones extend down through the nasal cavity
- 14. - also called windpipe
- 15. - are air-filled cavities
Down
- 1. - small openings the alveolar walls
- 2. - top of the larynx is a flap of cartilage
- 3. - are composed of two slippery , serous membranes
- 6. - roof of the mouth which separates the nasal cavity from mouth
- 7. - central area of thoracic cavity home of the heart, great blood vessels, trachea , esophagus,thoracic duct , thymus gland and other structures .
- 8. - cluster of lymphatic tissue first line of defense against infection
- 9. -the muscular passageway that extends from nasal cavity
- 11. - also known as the voice box air and food passageways