The circulatory system

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Across
  1. 3. Artery that supplies blood to the head
  2. 7. Valve that separates the right atrium from the right ventricle
  3. 8. Disease causing organisms
  4. 10. Valves that are common in veins
  5. 12. Red protein that functions in transport of oxygen
  6. 14. Largest artery in the human body leaving the left ventricle
  7. 15. Red blood cell
  8. 17. Blood cell that functions in immunity
  9. 19. Body circulatory system
  10. 20. Muscle the separates the left from the right side of heart
Down
  1. 1. Top smaller heart chamber
  2. 2. Valve that separates the left atrium and ventricle
  3. 4. Points of gaseous exchange
  4. 5. Vena cava that drains blood from head
  5. 6. Lung
  6. 9. Body cell
  7. 11. Dead blood cell that functions in clotting
  8. 13. Heart chamber that sends blood out of the heart
  9. 16. To maintain a constant internal environment
  10. 18. Join together to form veins