The Cardiovascular System

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Across
  1. 5. normal sound of the heart
  2. 7. fibers that exhibit an autorhythmicity of 30 action potentials per minute
  3. 8. another name for the right AV valve
  4. 9. the number of valves in the heart
  5. 10. type of valve that produces an abnormal whistling sound
  6. 12. side of the heart that has more muscle
  7. 15. type of cells that do the mechanical work (pumping)
  8. 16. type of valve that produces an abnormal swishing sound
  9. 18. node that exhibits an autorhythmicity of 70 action potentials per minute
  10. 20. side of the heart where nodes are located
  11. 21. period of relaxation and filling
  12. 23. neurotransmitter that mediates parasympathetic input to regulate heart rate (abbreviated)
  13. 24. external membrane that covers the heart, filled with pericardial fluid
Down
  1. 1. node that exhibits an autorhythmicity of 50 action potentials per minute
  2. 2. specialized regions of pacemaker cell groups
  3. 3. pathway that conducts pacemaker activity from the right atrium to the left atrium
  4. 4. component of ECG that represents depolarization of the ventricles
  5. 6. component of ECG that represents depolarization of the atria
  6. 9. what is prevented by having a plateau phase of action potential in contractile cells
  7. 11. innermost layer of the heart wall
  8. 13. pathway that conducts pacemaker activity from the SA node to the AV node
  9. 14. another name for the left AV valve
  10. 17. component of ECG that represents repolarization of the ventricles
  11. 18. period of contraction and emptying
  12. 19. type of cells that initiate and conduct action potentials
  13. 22. abnormal heart sound