The time required for the atrial impulse to travel through the atrioventricular node is defined as which of the following?
a. P–R segment c. QRS interval
b. P–R interval d. ST segment
ANS: B
The P–R interval ranges from 0.12 to 0.2 second and is the time it takes for the impulse initiated in the atria to travel through the atrioventricular node. The P–R segment occurs between the end of the P wave and the beginning of the QRS interval, corresponds to the 0.1-second delay that occurs within the atrioventricular node. The P–R segment is included in the P–R interval. The QRS interval represents ventricular depolarization, and the ST segment represents ventricular depolarization.
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