Which portion(s) of the cardiac conduction system is/are found in the right atrium of the heart?

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

Cardiac Conduction System

The network of nodes, cells, and signals that control the heart's rate and rhythm through electrical impulses.

Right Atrium

The right upper chamber of the heart that receives deoxygenated blood from the body and pumps it to the right ventricle.

SA Node

The sinoatrial node, acting as the natural pacemaker of the heart by initiating electrical impulses.