Across
- 7. red blood cell
- 8. fluid tissue found in open circulatory systems
- 11. liquid component of blood
- 13. blood with a lower oxygen content
- 14. vessels in open circulatory systems
- 15. organ which pumps blood or haemolymph
- 16. blood with a higher oxygen content
- 17. cell fragment in blood needed for clotting
- 18. large vessel returning blood to the heart
Down
- 1. areas where lymphatic vessels meet contain many white blood cells
- 2. vessels in closed circulatory systems
- 3. area around cells in tissues
- 4. large vessel taking blood away from the heart
- 5. fluid tissue found in closed circulatory systems
- 6. white blood cell
- 9. structures which control the direction of blood flow
- 10. molecule which transports oxygen around animals
- 12. fluid in the system which returns fluid from tissues to blood vessels