Across
- 5. A fluid that circulates throughout the body, carrying oxygen and nutrients
- 9. The system responsible for transporting blood throughout the body
- 10. One of the two lower chambers of the heart
- 11. The throat
- 12. Relating to the body as a whole
- 13. The system responsible for gas exchange
- 15. The primary organs of respiration
- 16. Relating to the lungs
- 17. The protein in red blood cells that carries oxygen
- 19. The windpipe
- 23. BLOOD CELL A type of blood cell that carries oxygen
- 25. A flap of tissue that covers the trachea during swallowing
- 26. The voice box
- 28. BLOOD CELL A type of blood cell that fights infection
- 30. The organ of smell and the entry point for air
- 31. Blood vessels that carry blood away from the heart
Down
- 1. Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged
- 2. DIOXIDE A waste gas produced during cellular respiration
- 3. A muscle that aids in breathing
- 4. Smaller branches of the bronchi
- 6. The largest artery in the body
- 7. Tiny blood vessels 2 where gas exchange occurs
- 8. CAVA A large vein that returns deoxygenated blood to the heart
- 14. Small cell fragments that help in blood clotting
- 18. A flap of tissue that prevents backflow of blood
- 20. One of the two upper chambers of the heart
- 21. The liquid component of blood
- 22. A gas essential for cellular respiration
- 24. The two main branches of the trachea
- 27. Blood vessels that carry blood 1 back to the heart
- 29. A muscular organ that pumps blood throughout the body