The Circulatory System

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Across
  1. 2. System that passes through the lungs.
  2. 3. Carries oxygenated blood away from the heart.
  3. 5. Returns deoxygenated blood to the heart.
  4. 6. Smallest blood vessels.
  5. 9. System where the blood passes once through the heart.
  6. 10. Closed system, the blood remains ______ the vessels.
  7. 11. Organisms that have an open circulation system.
  8. 13. The pump.
  9. 14. Pulmonary vein carries ______ blood to the heart.
  10. 17. Innermost layer.
  11. 18. Measured in mmHg.
  12. 19. System where the blood passes twice through the heart.
  13. 20. Valves in the veins.
Down
  1. 1. Pulmonary artery carries ______ blood away from the heart.
  2. 4. Arteries have the _______ and strongest walls.
  3. 7. Blood away from the kidney.
  4. 8. Organism that has a single circulation system
  5. 12. System that passes through the body.
  6. 15. Smaller arteries.
  7. 16. Veins have _______ walls.