Respiratory & Circulatory System

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Across
  1. 3. Lower chambers of the heart.
  2. 5. Number of chambers in the heart.
  3. 6. Main artery of the body.
  4. 10. Part of brain controlling breathing.
  5. 12. Upper respiratory tract cavity.
  6. 15. Upper chambers of the heart.
  7. 17. Flap that prevents blood backflow in heart.
  8. 18. Windpipe.
  9. 20. Sac-like organ containing alveoli.
  10. 21. Gas exhaled during breathing.
  11. 22. Process of air leaving lungs.
  12. 25. Double circulatory loop in humans.
  13. 27. Tubes that carry air into lungs.
  14. 28. Circulatory system part transporting nutrients.
  15. 29. Fluid that circulates in lymphatic system.
  16. 31. Liquid portion of blood.
  17. 33. The "voice box".
  18. 35. Organ that filters blood and produces lymphocytes.
  19. 37. Tiny air sacs in lungs.
  20. 38. Exchange of oxygen and carbon dioxide in lungs.
  21. 39. Circulatory system that moves blood through lungs.
  22. 40. Blood vessels carrying blood to the heart.
Down
  1. 1. Blood vessels carrying oxygenated blood back to heart.
  2. 2. Vein returning blood from body to heart.
  3. 4. Vessel that carries blood away from heart.
  4. 7. Red pigment in blood carrying oxygen.
  5. 8. Process of air entering lungs.
  6. 9. Blood cells that fight infection.
  7. 11. Muscle that pumps blood.
  8. 13. Membrane surrounding the heart.
  9. 14. Iron-rich protein in red blood cells.
  10. 16. Process of breathing.
  11. 19. Smallest branches of bronchi.
  12. 23. Fluid tissue transporting hormones.
  13. 24. Tiny hair-like structures filtering air.
  14. 26. Smallest blood vessels where gas exchange occurs.
  15. 30. Gas inhaled during breathing.
  16. 32. Dome-shaped muscle used in breathing.
  17. 34. Blood cells that carry oxygen.
  18. 36. Blood vessels carrying blood from heart to lungs.