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