Cardiovascular crossword

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Across
  1. 4. the upper chambers of the heart
  2. 6. the difficulty with which the molecules of a fluid flow past one another/resistance to flow
  3. 8. the constriction of blood vessels by smooth muscle in their walls
  4. 10. two large veins that the right atrium receives blood from
  5. 13. corresponds to the visceral pericardium, protecting the heart by reducing friction
  6. 14. inner layer of the heart wall, consists of epithelium and underlying connective tissue also contains blood vessels and covers specialized cardiac cells
  7. 15. quick noninvasive method for a fast heart rhythm called supraventricular tachycardia
  8. 19. sends oxygen poor blood to the lungs to pick up oxygen and unload CO2
  9. 22. the amount of blood ejected from the ventricle in each cardiac cycle
  10. 23. transport blood back to the atria and follow pathways almost parallel to arteries
  11. 25. lower Chambers that force the blood out of heart into arteries
  12. 26. microscopic vessels that continue from the capillaries and merge to form veins
  13. 27. generates an electrical signal that causes the upper heart chambers to contract
Down
  1. 1. an irregular heartbeat that occurs when the electrical signals in the atria fire rapidly at the same time
  2. 2. a covering that encloses the heart and the proximal ends of the large blood vessels to which it attaches
  3. 3. the relationship between cell length and force of contraction
  4. 5. middle layer of heart wall, thick and consists largely of cardiac muscle tissue that pumps blood out of chambers
  5. 7. relaxation of the heart chambers
  6. 9. a wall of tissue separating the heart's right and left side
  7. 11. recording of the electrical changes in the myocardium during a cardiac cycle
  8. 12. very small blood vessels that branch from the arteries
  9. 16. electrically connects the heart's atria and ventricles to coordinate beating in the top of the heart
  10. 17. large fibers that conduct the impulse to distant region of the ventricular myocardium
  11. 18. contraction of the heart chambers
  12. 20. largest diameter artery in the body
  13. 21. strong, elastic vessels adopted for transporting blood away from the heart under high pressure
  14. 24. guarantees blood in one direction and avoid back flow