Across
- 5. windpipe
- 6. a deficiency caused by lack of iron
- 8. binds to oxygen
- 10. smallest vessel
- 12. site of gas exchange
- 13. where blood is made (4,6)
- 14. cells that defend against disease
- 19. transported in lymph from the intestines
- 21. produced by white blood cells
- 22. expands the lungs
- 23. vital for clotting
- 24. branch off the windpipe
Down
- 1. shape of a red blood cell
- 2. contracts and expands to alter lung volume
- 3. chamber of the heart
- 4. stops the back-flow of blood
- 7. carbon ___________ respiration waste
- 9. high pressure tube
- 11. bleeding
- 14. inside the vessels
- 15. blood pump
- 16. carry blood to the heart
- 17. colour of erythrocytes
- 18. result of clotting
- 20. windpipe
- 23. 55% of the blood