Across
- 1. The main artery carrying oxygenated blood.
- 4. Breathing
- 8. Protein in red blood cells that binds to oxygen.
- 9. The muscular organ that pumps blood.
- 12. Blood passes through the heart twice.
- 14. The fluid part of blood.
- 15. Rhythmic contraction and relaxation of the heart.
- 16. Vessels that carry blood back to the heart.
- 17. Cells that carry oxygen.
- 18. Vessels that carry blood away from the heart.
Down
- 2. Pumps deoxygenated blood to the lungs.
- 3. Cells that fight infections.
- 5. The liquid that carries nutrients.
- 6. Tiny blood vessels connecting arteries to veins.
- 7. Pumps oxygenated blood to the body.
- 10. White blood cells that produce antibodies.
- 11. Blood flow
- 13. Cells that help in blood clotting.
- 16. Prevents blood from flowing backward.