Across
- 1. Heart chambers that pump blood out
- 3. Blood vessels that carry blood away from the heart
- 4. Tiny air sacs where gas exchange occurs
- 7. Two main branches of the trachea entering the lungs
- 10. Blood cells that carry oxygen
- 13. Protein in red blood cells that binds oxygen
- 14. Heart chamber that receives blood
- 15. Microscopic blood vessels where exchange occurs
- 18. Area where air and food passages cross
- 19. External openings where air enters the respiratory system
- 24. Small branches of bronchi that conduct air to alveoli
- 27. Organ system that delivers oxygen and removes carbon dioxide
Down
- 2. Process of blood clotting
- 5. Flap of tissue that prevents food from entering the trachea
- 6. Blood cells that fight disease
- 8. Organ system that moves substances to and from cells
- 9. Testing blood to determine health conditions
- 11. Most important organs of the respiratory system
- 12. Muscle that helps move air in and out of the lungs
- 16. Blood components responsible for clotting
- 17. Muscular organ that pumps blood through the body
- 20. Blood vessels that carry blood toward the heart
- 21. Tube reinforced with cartilage that carries air to the lungs
- 22. Condition caused by iron deficiency and small red blood cells
- 23. Sticky strands that form a blood clot
- 25. Organ that controls air flow and voice production
- 26. Liquid portion of blood made mostly of water