Across
- 2. fibers that open and close the AV valves
- 7. inner surface of the heart
- 9. blood vessels that return blood to the heart from the lungs
- 17. part of the cardiac cycle when the chambers relax
- 18. outer surface of the heart
- 22. part of the cardiac cycle when the chambers contract
- 23. muscles that control the AV valves
- 24. number of heart beats per minute
- 26. volume of blood in mL/min that exits the heart
- 27. atrioventricular valve on the left side of the heart
- 28. volume of blood in mL per heart beat
- 29. semilunar valve between the left ventricle and aorta
- 30. chamber to which deoxygentated blood returns heart
- 32. circulation between heart and lungs
- 33. returns venous blood to heart from the trunk, abdomen, and extremities
- 34. cavity within the thorax where the heart is located
Down
- 1. double layer sac that covers the heart
- 3. chamber that pumps blood to the lungs
- 4. device that detects the heart's electrical signals
- 5. pacemaker cells of the heart
- 6. blood vessels that feed the heart's muscular walls
- 8. muscular layer of the heart
- 10. heart attack
- 11. returns venous blood to heart from the head and neck
- 12. connections between heart cells that create a syncytium
- 13. atrioventricular valve on right side of heart
- 14. normal heart rhythm
- 15. pumps blood into the aorta
- 16. chamber to which oxygenated blood returns to heart
- 19. semilunar valve between the right ventricle and pulmonary trunk
- 20. circulation between heart and whole body
- 21. abnormal heart rhythm
- 25. major coronary vein
- 31. major blood vessel that leaves the right ventricle