Which of the components of the cardiac conduction system briefly delays the signal from the pacemaker, so that the atria have time to fill the ventricles with blood, before the ventricles begin to contract?

A) AV bundle
B) SA node
C) Purkinje fibers
D) Left and right bundle branches
E) AV node

Cardiac Conduction

The process of electrical signal transmission through the heart, coordinating its beating.

AV Node

The atrioventricular node, a part of the electrical conduction system of the heart that coordinates the top of the heart. It acts as an electrical relay station, slowing the electrical current sent by the sinoatrial node before the signal is permitted to pass down through to the ventricles.

Pacemaker

An electronic medical device implanted in the chest to regulate the heartbeat, used in conditions where the heart's natural rhythm is too slow.