question: Q:A researcher is studying how electrical activity propagates across the heart. In order to do this, he decides to measure the rate at which an action potential moves within various groups of cardiac muscle tissue. In particular, he isolates fibers from areas of the heart with the following characteristics:
  
  A) Dysfunction leads to fixed PR intervals prior to a dropped beat
  B) Dysfunction leads to increasing PR intervals prior to a dropped beat
  C) Dysfunction leads to tachycardia with a dramatically widened QRS complex
  D) Dysfunction leads to tachycardia with a sawtooth pattern on electrocardiogram
  
  Which of the following is the proper order of these tissues from fastest action potential propagation to slowest action potential propagation.? 
  {'A': 'A > C > D > B', 'B': 'A > D > C > B', 'C': 'B > C > D > A', 'D': 'B > D > C > A', 'E': 'D > C > A > B'},