Circulatory and Respiratory System

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Across
  1. 5. letting air out
  2. 6. delicate blood vessels that exist throughout your body
  3. 9. pressure of circulating blood against the walls of blood vessels
  4. 13. a harmful waste gas that you need to get out
  5. 15. small, colorless cell fragments in blood to form clots and stop bleeding
  6. 17. a disease that makes it difficult to breathe
  7. 18. a dome shped muscle
  8. 19. where the gas exchange occurs
  9. 20. red blood cells, carry oxygen throughout the body
Down
  1. 1. tiny air sacs surrounded by blood vessels and capillaries
  2. 2. protein that has iron which makes the transport of oxygen easier
  3. 3. sends air to lungs
  4. 4. bring air in
  5. 7. blood vessels that carry oxygen rich blood to organs
  6. 8. brings oxygen and nutrients to all parts of the body so it can keep moving
  7. 10. invisible gas inside the body which allows the cells to function properly
  8. 11. main function of the respiratory system, which in complex animals is responsible for carrying air to the lungs
  9. 12. (verb) pulls together
  10. 14. where oxygen moves into, carbon dioxide moves out
  11. 16. blood vessels that carry deoxygenated blood back to the heart