Across
- 4. Tiny air sacs where gas exchange occurs
- 6. Single microscopic sac for oxygen and carbon dioxide exchange
- 8. Protective layers surrounding the heart
- 10. Inner membrane directly covering the lungs
- 12. Fluid-filled space between lung membranes
- 15. Three-lobed respiratory organ on the body’s right side
- 16. Breastbone that anchors the ribs at the front of the chest
- 17. Muscle between ribs that aids in breathing
Down
- 1. Outer membrane lining the chest cavity
- 2. Major vessel carrying deoxygenated blood from the heart to the lungs
- 3. Cluster of alveoli resembling a bunch of grapes
- 5. Tiny openings connecting adjacent alveoli
- 7. Windpipe that carries air from the larynx to the lungs
- 9. Food tube running behind the trachea
- 11. Two-lobed lung that makes room for the heart
- 13. Immune-related gland sitting just above the heart in the chest
- 14. Chest structure made of ribs, muscles, and connective tissue