Across
- 6. Openings between alveoli that allow air to pass between sacs
- 7. Structure forming the outer boundary of the chest cavity
- 12. Flat bone in the center of the chest protecting vital organs
- 14. Single air sac where gas exchange occurs
- 15. Broad lower surface of the lung resting on the diaphragm
- 16. Tiny air sacs where oxygen and carbon dioxide are exchanged
- 17. Small airways in the lungs where gas exchange begins
- 19. Layers surrounding the heart that protect and anchor it
- 20. Space between the lungs and chest wall filled with fluid to reduce friction
Down
- 1. Uppermost pointed portion of the lung
- 2. Groove that separates the upper and middle lobes of the right lung
- 3. Membrane directly covering the surface of the lungs
- 4. Gland located behind the sternum involved in immune system development
- 5. Tube located behind the trachea that carries food to the stomach
- 8. Passageway that carries air from respiratory bronchioles to alveolar sacs
- 9. Membrane lining the inside of the thoracic cavity
- 10. Organ located between the lungs that pumps blood through the body
- 11. Cluster of alveoli at the end of an alveolar duct
- 13. Area where bronchi, blood vessels, and nerves enter and leave the lung
- 18. Tube located in the neck and chest that carries air to the lungs