If the connection between the SA node and AV node becomes blocked,
A) The QRS complex will be absent on an ECG.
B) The ventricles will beat more slowly.
C) The atria will beat slower.
D) Tachycardia will occur.
E) The QRS complex will be absent on an ECG and tachycardia will occur.

Question

Quizplus · Accepted Answer

If the connection between the SA node and AV node becomes blocked, the ventricles will beat more slowly. This is because the AV node serves as a backup pacemaker, and in the absence of signals from the SA node it will initiate its own impulses to keep the heart beating, but at a slower rate than the SA node typically does.

If the Connection Between the SA Node and AV Node