Circulatory System Crossword Puzzle

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Across
  1. 1. The heart's longest venous vessel, responsible for draining most of the deoxygenated blood
  2. 9. One of the two lower heart chambers that receive blood from an atrium and pump it to the rest of the body
  3. 10. An artery that is short and transports deoxygenated blood from the heart to the lungs
  4. 14. A large vein that sends back deoxygenated blood from the body to the right atrium
  5. 15. Divides the ventricles and great arteries
  6. 17. The cycle that involves blood getting pumped out of the heart and oxygen circulating throughout the body
  7. 18. Covers the heart wall's inner surface
  8. 19. Strong and thin strands of connective tissue, attached to the leaflets of each atrioventricular valve to prevent it from opening into the atrium
  9. 20. Compose the myocardium of the heart wall
  10. 21. The largest venous structure of the heart that drains majority of the deoxygenated blood exiting the myocardium
Down
  1. 2. The valves that separate the atria and ventricles, as well as obstruct blood backflow from the ventricles to the atria during systole
  2. 3. A fibrous sac that encloses the heart
  3. 4. Covers the heart's outermost surface
  4. 5. Name
  5. 6. The valve in the heart that opens and closes to make sure that blood is flowing in the right direction
  6. 7. A heart chamber that has thin walls and receives blood from the veins
  7. 8. One of the two branches of left main coronary artery, supplies blood to the front of the heart and to the septum
  8. 11. The largest artery in the human body
  9. 12. The valve that allows blood flow from the left ventricle to the aorta and prevents the backflow of blood
  10. 13. The narrow end of the heart
  11. 16. The thick middle layer of the heart wall