The electrical stimulus of the cardiac cycle follows which sequence?
a. AV node SA node bundle of His
b. Bundle of His AV node SA node
c. SA node AV node bundle of His bundle branches
d. AV node SA node bundle of His bundle branches
ANS: D
Specialized cells in the SA node near the superior vena cava initiate an electrical impulse. The current flows in an orderly sequence, first across the atria to the AV node low in the atrial septum. There it is delayed slightly, allowing the atria the time to contract before the ventricles are stimulated. Then the impulse travels to the bundle of His, the right and left bundle branches, and then through the ventricles.
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