Circulatory, respiratory and immunity systems

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Across
  1. 6. carry blood to the heart
  2. 8. these clot after an injury
  3. 11. contracting and relaxing of the heart
  4. 13. dose of weakened virus or bacteria
  5. 14. caused by blood clot in the brain
  6. 15. smallest blood vessels
  7. 17. protein that carries oxygen
  8. 18. the body of 4-6 quarts of this
  9. 19. top chambers in the heart
  10. 21. how many chambers are in the heart?
  11. 22. another name for the trachea
Down
  1. 1. tiny air sacs
  2. 2. keeps all pathogens out of the body
  3. 3. can be treated with antibiotics
  4. 4. carry blood away from the heart
  5. 5. high blood pressure
  6. 7. flap that covers the trachea
  7. 8. destroy bacteria by digesting it
  8. 9. part of 1st line of defense
  9. 10. proteins that bind to antigens
  10. 12. part of 2nd line of defense
  11. 16. how strong the blood is pushing
  12. 20. where gas exchange takes place
  13. 22. blood cell that fights infections