Circulatory & Respiratory System

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Across
  1. 1. Heart chambers that pump blood out
  2. 3. Blood vessels that carry blood away from the heart
  3. 4. Tiny air sacs where gas exchange occurs
  4. 7. Two main branches of the trachea entering the lungs
  5. 10. Blood cells that carry oxygen
  6. 13. Protein in red blood cells that binds oxygen
  7. 14. Heart chamber that receives blood
  8. 15. Microscopic blood vessels where exchange occurs
  9. 18. Area where air and food passages cross
  10. 19. External openings where air enters the respiratory system
  11. 24. Small branches of bronchi that conduct air to alveoli
  12. 27. Organ system that delivers oxygen and removes carbon dioxide
Down
  1. 2. Process of blood clotting
  2. 5. Flap of tissue that prevents food from entering the trachea
  3. 6. Blood cells that fight disease
  4. 8. Organ system that moves substances to and from cells
  5. 9. Testing blood to determine health conditions
  6. 11. Most important organs of the respiratory system
  7. 12. Muscle that helps move air in and out of the lungs
  8. 16. Blood components responsible for clotting
  9. 17. Muscular organ that pumps blood through the body
  10. 20. Blood vessels that carry blood toward the heart
  11. 21. Tube reinforced with cartilage that carries air to the lungs
  12. 22. Condition caused by iron deficiency and small red blood cells
  13. 23. Sticky strands that form a blood clot
  14. 25. Organ that controls air flow and voice production
  15. 26. Liquid portion of blood made mostly of water