Across
- 2. Pumps blood (Middle mediastinum)
- 4. Main breathing muscle (Base of thorax)
- 8. Protects heart/anchors ribs (center of chest)
- 10. Protective enclosure (Ribs and muscles)
- 11. Fluid filled friction reducer (Between pleural layers)
- 12. Tiny air sacs (Functional lung unit)
- 14. Food tube (Posterior to trachea)
- 17. Lines the chest cavity (inner thoracic wall)
- 19. Gas exchange organ (left thoracic cavity)
- 20. Individual site of gas exchange (Functional unit of lung)
Down
- 1. Start of gas exchange (Distal to terminal bronchioles)
- 3. T-cell maturation site (superior to heart)
- 5. Divides right upper/middle lobes (Right lung only)
- 6. Protective heart sac (surrounding the heart)
- 7. Carries deoxygenated blood (enters left lung)
- 9. Air channel
- 13. Connects bronchioles to sac (Deep lung tissue)
- 15. Cluster of gas exchange chambers (end of alveolar ducts)
- 16. Routes blood to lungs (Exits right ventricle)
- 18. Superior tip of lung (Deep to clavicle)