A recording of the electrical activity of a patient's heart shows that the atria are contracting regularly and normally, but every few beats the ventricles fail to contract. Which of the following is probably not functioning properly?
A) Valves between the atria and the ventricles.
B) Sinoatrial node.
C) Atrioventricular node.
D) Pacemaker.
E) Tricuspid valve.

Question

Quizplus · Accepted Answer

The atrioventricular node is responsible for transmitting the electrical signal from the atria to the ventricles. If the atria contract normally but the ventricles fail to contract every few beats, it suggests a problem with the AV node's ability to conduct signals consistently.

A Recording of the Electrical Activity of a Patient's Heart