The Circulatory System: The Heart

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Across
  1. 2. makes up most of heart, mainly consisting of cardiac muscle
  2. 5. heart's own type of muscle, short and fat, one or two nuclei each, branched and interlocked with each other
  3. 7. type of semilunar valve
  4. 8. cardiac and skeletal muscle are _______
  5. 10. receiving chambers
  6. 13. layer of endothelium that lines the heart chambers
  7. 14. _______ connect each atrium to corresponding ventricle
  8. 15. junctions between the cells are called _______
  9. 17. dense connective tissue that protects the heart
  10. 18. pumping chambers
  11. 19. the medial cavity of the thorax
  12. 20. inner layer of serous pericardium, outermost layer of heart wall
  13. 21. delivers blood to the right atrium from upper parts of body
  14. 22. outer layer of the serous pericardium
  15. 24. the layers surrounding the heart chanbers
  16. 26. _______ keep the blood going in the correct direction
  17. 27. delivers blood to the right atrium from lower parts of body
  18. 29. delivers blood to the right atrium draining from the myocardium
  19. 30. the outermost layer of the pericardium
Down
  1. 1. right AV valve, three flaps
  2. 3. left AV valve, two flaps
  3. 4. ventricles are separated by _______
  4. 6. hold things together
  5. 8. passage of the oxygenated blood from the left ventricle through the body, providing oxygen and nutrients, and back to the right atrium
  6. 9. atria are separated by the _______
  7. 11. second layer of the pericardium
  8. 12. type of semilunar valve
  9. 16. connect ventricles and arteries that stem from them and prevent blood that is leaving from flowing back into ventricle
  10. 17. passage of the blood from the right ventricle through the lungs and back to the left atrium
  11. 23. largest artery in the body
  12. 25. dense network of connective tissue fiber that provides structural support and insulates electrical activity
  13. 26. muscular organ that pumps blood through the circulatory system
  14. 28. allow for ions to pass through