Circulatory System

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Across
  1. 3. the protein that carries oxygen to the heart and carbon dioxide to the lungs
  2. 5. single nucleus
  3. 6. contain histamine and heparin
  4. 9. occurs between only the heart and the lungs
  5. 12. muscle located under the rib cage that causes the rib cage to expand and contract, making air passage easier
  6. 14. innermost layer that prevents blood from clotting
  7. 15. Largest structure of the heart
  8. 17. red blood cells
  9. 19. occurs between the heart and every part of the body except the lungs
  10. 20. a mixture of cells, cell fragments, and fluid along with particles of fat, other nutrients, and dissolved gasses
  11. 21. made of tissue and elastic fibers
  12. 23. made of muscle and elastic fibers that contract and expand to help blood flow
Down
  1. 1. tiny blood vessels that transport blood to and from cells
  2. 2. blood vessels that carry blood away from the heart
  3. 4. usually spherical with bumps on the outside
  4. 7. passage used to bring air into the lungs
  5. 8. air sacs at the end of bronchioles
  6. 9. 2 basic components of blood
  7. 10. One of the main functions of the heart
  8. 11. any substance that can cause your immune system to produce antibodies against it
  9. 13. 2 larger chambers
  10. 14. U shaped
  11. 16. 2 smaller chambers of the heart
  12. 18. clear yellow fluid that makes up 55% of the blood
  13. 22. carry blood from the rest of the body back to the heart