what are the causes of av node malfunction
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The transmission delay at the AV node in the heart allows both ventricles to relax and be refilled by the contracting atria. After the AV node delay, the ventricles contract and force blood into the aorta (systemic circulation).
Av bundle
The sino-atrial node (or SA node) is located in the right atrium, just below the entrance of the superior vena cava in the upper right portion of the right atrium.
SA node, AV node, AV Bundle, Bundle branches, subedocardial branches (purkinje fibers)