Back to the Basics Crossword Puzzle

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Across
  1. 2. A large vein that carries deoxygenated blood from the lower body to the heart.
  2. 5. The chamber that receives oxygenated blood from the lungs.
  3. 6. The valve that prevents blood from flowing back into the left ventricle from the aorta.
  4. 8. Blood that is returning to the heart, low in oxygen and high in carbon dioxide.
  5. 9. The valve between the right atrium and right ventricle.
  6. 11. The wall that divides the right and left sides of the heart.
  7. 13. The natural pacemaker of the heart that initiates the heartbeat.
  8. 14. A complete heartbeat including contraction and relaxation phases.
  9. 16. A large vein that carries deoxygenated blood from the upper body to the heart.
  10. 19. The chamber that pumps deoxygenated blood to the lungs.
  11. 20. The protective sac that surrounds the heart.
Down
  1. 1. The valve that connects the left atrium and left ventricle.
  2. 3. Blood that has picked up oxygen from the lungs.
  3. 4. The vessels that return oxygenated blood from the lungs to the left atrium.
  4. 7. The largest artery in the body that carries oxygenated blood from the heart to the body.
  5. 10. The artery that carries deoxygenated blood from the right ventricle to the lungs.
  6. 12. The arteries that supply blood directly to the heart muscle.
  7. 15. The heart's most muscular chamber that pumps oxygenated blood to the body.
  8. 17. The process of blood flowing through the heart, lungs, and body.
  9. 18. The chamber of the heart that receives deoxygenated blood from the body.