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
- 13. Brings oxygenated blood from lungs to heart
- 14. Fragments that help in clotting
- 15. System that transports substances in humans
- 18. 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. Red pigment that carries oxygen
- 4. Supplies blood to heart muscles
- 5. Upper chamber of the heart
- 7. Muscular organ that pumps blood
- 11. Blood vessel carrying blood to the heart
- 12. Blood vessel carrying blood away from heart
- 15. Tiny blood vessel for exchange of substances
- 16. Carries oxygen using haemoglobin
- 17. Rhythmic stretching of arteries due to heartbeat