Across
- 4. A waste gas removed from the body during exhalation.
- 5. Large vein that carries oxygen-poor blood back to the heart.
- 7. The liquid part of the blood.
- 9. The movement of blood through the body.
- 11. The process of taking air into the lungs.
- 12. The process by which cells use oxygen to produce energy.
- 15. Blood passes through the heart twice in one complete cycle.
- 19. Blood vessels that carry blood away from the heart.
- 20. Flap in the heart that prevents blood from flowing backward.
- 22. Carries deoxygenated blood from the heart to the lungs.
- 23. The windpipe; connects the throat to the lungs.
- 25. Muscle that helps expand and contract the lungs during breathing.
- 26. Cells that fight infection.
- 28. Cell fragments that help with blood clotting.
- 29. The force of blood pushing against the walls of blood vessels.
Down
- 1. The rhythmic beating of arteries as blood is pumped.
- 2. Muscular organ that pumps blood throughout the body.
- 3. Blood vessels that carry blood back to the heart.
- 6. Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged.
- 7. Carries oxygenated blood from the lungs to the heart.
- 8. Two main branches from the trachea that lead into each lung.
- 10. Tiny blood vessels where exchange of gases and nutrients occurs.
- 13. The process of releasing air from the lungs.
- 14. Organs responsible for gas exchange in the body.
- 16. The largest artery that carries oxygen-rich blood from the heart to the body.
- 17. The transfer of oxygen into the blood and carbon dioxide out of the blood.
- 18. Upper chamber of the heart that receives blood.
- 21. Lower chamber of the heart that pumps blood out.
- 24. Cells that carry oxygen.
- 27. A gas that the body needs for cellular respiration.