Multiple Choice Questions

The order of impulse conduction in the heart, from beginning to end, is __________.
  • SA node, AV node, bundle of His, bundle branches, and Purkinje fibers
  • Gap junctions allow action potentials to spread to connected cells.
  • The SA node would depolarize less quickly, reducing the heart rate.
  • so blood is forced upward, toward the semilunar valves
Why are gap junctions a vital part of the intercellular connection of cardiac muscles?
  • The epicardium is also considered the parietal pericardium.
  • quiescent period: total heart relaxation between heartbeats
  • Gap junctions allow action potentials to spread to connected cells.
  • reduced efficiency in the delivery of blood to the lungs
At what rate does the sinoatrial (SA) node depolarize?
  • ventricular systole
  • intercalated discs
  • 75 times per minute
  • epinephrine
Adding a chemical that reduces Na+ transport near the sinoatrial (SA) node would have what effect on the heart's intrinsic conducting system?
  • The SA node would depolarize less quickly, reducing the heart rate.
  • The epicardium is also considered the parietal pericardium.
  • Preload would be increased, which would increase cardiac output.
  • quiescent period: total heart relaxation between heartbeats
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Multiple Choice Questions
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