Blood

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