Circulatory System Crossword

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Across
  1. 2. Organ system that distributes the blood to deliver nutrients and remove wastes.
  2. 5. Contraction of the heart
  3. 11. Blood vessels that carry blood back IN to the heart
  4. 12. Divides the right and left chambers of the heart
  5. 16. A vein that is the second largest vein in the human body and returns blood to the right atrium of the heart from the upper half of the body.
  6. 18. partition between the right and left ventricles
  7. 20. Microscopic vessel through which exchanges take place between the blood and cells of the body
  8. 21. A complete heartbeat consisting of contraction and relaxation of both atria and both ventricles
  9. 23. superior heart chambers that receive blood from the veins
  10. 24. outermost layer of the heart muscle and is actually part of the heart wall
  11. 26. pulmonary artery and aortic valves that prevent blood return to the ventricles after contraction
  12. 27. another name for the SA Node
Down
  1. 1. Relaxation of the heart
  2. 3. valves that separate each atrium and ventricle; include the tricuspid (R side) and bicuspid/mitral valve (L side)
  3. 4. flow of blood from body tissue to the heart and then from the heart back to body tissues to distribute nutrients/O2 and pick up waste/CO2
  4. 6. The left AV valve, consists of two flaps of endocardium.
  5. 7. Double-layered membrane surrounding the heart.
  6. 8. membrane lining the interior of the heart
  7. 9. discharging chambers of the heart; receive blood through valves from the atria
  8. 10. A vein that is the largest vein in the human body and returns blood to the right atrium of the heart from body parts below the diaphragm.
  9. 13. Thick middle muscle layer of the heart
  10. 14. flow of blood from the heart to the lungs and back to the heart for gas exchange
  11. 15. A valve that is situated at the opening of the right atrium of the heart into the right ventricle and that resembles the mitral valve in structure but consists of three triangular membranous flaps.
  12. 17. pointed end of the heart
  13. 19. Carries deoxygentated blood from the heart to the lungs
  14. 22. Blood vessels that carry blood away from the heart
  15. 25. The largest artery that carries oxygenated blood from the left ventricle of the heart to the body