APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The electrical impulse travels from the sinus node to the atrioventricular node (also called AV node). There, impulses are slowed down for a very short period, then continue down the conduction pathway via the bundle of His into the ventricles.

Detailed explanation-2: -atrioventricular (AV) valve is NOT part of the intrinsic conduction system of the heart and therefore the correct answer. The atrioventricular valves are found between the atrium and the ventricle of the heart and open and close in response to the pumping of the heart.