Circulatory System

12345678910111213141516171819202122
Across
  1. 3. Leads blood away from the heart
  2. 4. Structures that keep blood flowing one direction through the heart
  3. 6. Type of blood cell that defends against infections
  4. 9. Valve connecting the right atrium and ventricle
  5. 10. Passageway of blood through the body
  6. 11. Valve connecting the left ventricle to the aorta
  7. 12. Type of circulatory system of mammals
  8. 16. Controls the flow of blood through the body
  9. 18. Type of blood cell that transports oxygen
  10. 20. Artery that leads blood to the lungs
  11. 21. First chamber blood enters from both vena cava veins
  12. 22. Valve connecting the left atrium and ventricle
Down
  1. 1. Connects arteries to veins
  2. 2. Leads blood toward the heart
  3. 4. Name of chamber that pumps blood out of the heart
  4. 5. Liquid part of blood
  5. 7. These animals have a single loop circulatory system
  6. 8. Transports cells and nutrients
  7. 9. Number of chambers in the heart of most reptiles
  8. 13. Number of ventricles in a three chamber heart
  9. 14. The pulmonary vein brings oxygenated blood back to the heart from this organ
  10. 15. Valve connecting the right ventricle to the pulmonary artery
  11. 17. Major artery of the heart to supply the rest of the body with blood
  12. 19. Type of blood cell that assists with blood clotting