Across
- 1. shoulder blades
- 4. largest artery in the body
- 7. carries deoxygenated blood from lungs to heart
- 8. carries oxygenated blood from lungs to heart
- 11. finger and toe bones
- 12. flap of tissue in the heart that prevents blood from flowing in the wrong direction
- 13. protects your brain
- 14. A thick sticky substance that lines and protects the inner wall of the digestive organs
Down
- 2. a waste product produced during respiration
- 3. one of the paired respiratory system organs
- 5. two large air tubes from the trachea
- 6. the respiratory tube that extends from the larynx to the main bronchi
- 8. collarbone
- 9. thin-walled, air-filled sacs in which gas exchange occurs
- 10. breastbone