Why is the electrical signal delayed slightly at the AV node? 1.To allow better filling of the ventricles
2)To protect the ventricles against excessively rapid atrial rates
3)To provide time for atrial contraction prior to ventricular systole
4)To prevent premature atrial beats from reaching the ventricles

Question

Quizplus · Accepted Answer

Once the electrical impulse reaches the AV node, it is delayed for approximately 0.1 second before it passes on into the bundle of His. The delay is believed to serve the purpose of allowing more complete filling of the ventricles before ventricular contraction, which occurs as the result of atrial contraction. In addition, the AV node can protect the ventricles from excessively rapid atrial rates that the ventricles could not tolerate.

Why Is the Electrical Signal Delayed Slightly at the AV