Across
- 2. circulation between the heart and lungs
- 5. helps in breathing by contracting and relaxing
- 6. connecting the mouth and nasal passages to the esophagus
- 8. The two large airways that lead from the trachea to the lungs
- 9. Small air sacs in the lungs where gas exchange occurs
- 10. Blood vessels that carry blood back to the heart
- 11. connects the larynx to the bronchi
- 14. voice box
- 15. Organs responsible for the exchange of oxygen and carbon dioxide
- 18. flap of tissue that covers the windpipe
- 19. responsible for clotting
Down
- 1. Smaller airways that branch off from the bronchi within the lungs
- 3. Tiny blood vessels where gas exchange occurs
- 4. liquid component of blood, containing water, salts, and proteins
- 7. protein in red blood cells that carries oxygen
- 10. lower chamber of the heart that pumps blood out to the lungs or body
- 12. upper chamber of the heart that receives blood
- 13. largest artery in the body
- 16. The muscular organ that pumps blood throughout the body
- 17. Blood vessels that carry oxygen-rich blood away from the heart