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Across
  1. 2. The largest artery in the body
  2. 4. Smallest blood vessels where gas exchange occurs
  3. 5. Prevent backflow of blood in the heart
  4. 7. cava, Vein that brings blood from the body to the heart
  5. 10. blood cells, Help fight infections in the body
  6. 12. Lower chamber of the heart that pumps blood
  7. 14. Type of blood found in the left side of the heart
  8. 15. Circuit that carries blood to and from the lungs
  9. 16. The liquid part of blood making up 55%
  10. 17. Valve between left atrium and left ventricle
  11. 19. node, Pacemaker of the heart
  12. 20. Carry blood toward the heart
Down
  1. 1. Type of blood found in the right side of the heart
  2. 3. Upper chamber of the heart that receives blood
  3. 6. Divides the left and right sides of the heart
  4. 8. Carry blood away from the heart
  5. 9. Valve between right atrium and right ventricle
  6. 11. Help with blood clotting
  7. 13. veins, Bring oxygenated blood from lungs to heart
  8. 18. blood cells, Carry oxygen using hemoglobin