On the ECG, the time necessary for the spread of an electrical impulse through the AV node, bundle of His, right and left bundle branches, and the Purkinje fibers is reflected by the _____
a. TP segment
b. PR segment
c. QT interval
d. QRS duration
B
The PR segment is the horizontal line between the end of the P wave and the beginning of the QRS complex. It is part of the PR interval and represents activation of the AV node, the bundle of His, the bundle branches, and the Purkinje fibers.
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