Respiratory System / Cardiovascular System

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Across
  1. 5. the windpipe
  2. 7. the largest blood vessel in the body
  3. 9. tiny sacs of lung tissue that are specialized in the movement of gasses between air and blood
  4. 12. protein in red blood cells containing oxygen
  5. 14. valve between the right atrium and the right ventricle
  6. 15. blood vessels that carry blood back to the heart
  7. 17. carries deoxygenated blood from the heart to the lungs (two words)
  8. 19. lower chamber of the heart
  9. 20. upper chamber of the heart
Down
  1. 1. a flap of tissue that seals off the windpipe
  2. 2. passages that direct air to the lungs
  3. 3. the liquid part of blood
  4. 4. large muscle that helps with breathing
  5. 6. smallest parts of what directs air into the lungs
  6. 8. what helps blood clot
  7. 10. the smallest blood vessels
  8. 11. carries blood from lower regions of the body to right atrium (three words)
  9. 13. valve between the left atrium and the left ventricle; bicuspid valve
  10. 16. receives blood from the head and arms and chest and empties into the right atrium of the heart (three words)
  11. 18. carry blood away from the heart