Across
- 6. Blood passes through the heart twice per circuit
- 8. Lower chamber of the heart
- 9. Large vein returning blood to heart
- 10. Main artery carrying blood from heart to body
- 12. Brings oxygenated blood from lungs to heart
- 13. Fragments that help in clotting
- 14. System that transports substances in humans
- 17. Liquid part of blood transporting substances
- 19. Carries blood from heart to lungs
Down
- 1. Cells that fight infections
- 2. Structure preventing backflow of blood
- 3. Blood vessel carrying blood to the heart
- 4. Supplies blood to heart muscles
- 5. Upper chamber of the heart
- 7. Muscular organ that pumps blood
- 11. Blood vessel carrying blood away from heart
- 14. Tiny blood vessel for exchange of substances
- 15. Carries oxygen using haemoglobin
- 16. Clear fluid that drains tissue spaces and returns to blood
- 18. Red pigment that carries oxygen