Circulatory & Respiratory Systems Crossword

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Across
  1. 4. the first chamber that deoxygenated blood enters in the heart
  2. 7. the valve that connects the left atrium and ventricle
  3. 8. the protein in red blood cells that binds to oxygen
  4. 9. the muscle layer in the heart that contracts causing the heart to beat
  5. 10. the blood vessel that carries deoxygenated blood back towards the heart
  6. 11. keeps oxygenated blood from flowing from the aorta to the right ventricle
  7. 13. the two tubes that connect trachea to lungs
  8. 14. the component of blood that cntains dissolved gases and minerals
  9. 15. the largest artery in the body
  10. 16. the voicebox
  11. 18. the component of blood responsible for clotting and healing broken blood vessels
  12. 23. the tube that moves air from the mouth and nose to the lungs
  13. 27. the large vein through which oxygen-poor blood from the top half of the body enters the heart
  14. 28. smaller braches of the bronchi
  15. 29. supply the heart muscle cells with oxygen-rich blood
Down
  1. 1. this is the largest type of blood vessel in the body
  2. 2. the large vein through which oxygen-poor blood from the top half of the body enters the heart
  3. 3. the vessel that returns oxygenated blood to the heart
  4. 5. microscopic air sacs where gas exchange takes place
  5. 6. the only artery in the body that contains deoxygenated blood
  6. 12. the valve that connects the two right chambers of the heart
  7. 17. the chamber that deoxygenated blood leaves when it enters the pulmonary arteries
  8. 19. the last chamber that oxygenated blood enters in the heart
  9. 20. the first chamber that oxygenated blood enters in the heart
  10. 21. the component of blood that fights infection
  11. 22. the tiniest blood vessels in the body
  12. 24. the component of blood that contains hemoglobin and carries oxygen
  13. 25. the large dome shape muscle that contracts when we inhale
  14. 26. the area in the back of the throat