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)both a and d will occur

Question

Quizplus · Accepted Answer

If the connection between the SA node and AV node becomes blocked, the AV node can assume the role of pacemaker, but the ventricles will beat more slowly than if the SA node were in control. This is known as AV block or heart block. The P wave may be absent or abnormal on an ECG, but the QRS complex will still be present as it is generated by the ventricles. There is no evidence to suggest that the atria will beat slower or that tachycardia will occur.

If the Connection Between the SA Node and AV Node