ANATOMY

Detailed explanation-1: -[1] After electrical impulse is sent from the sinoatrial (SA) node to the atrioventricular (AV) node, the bundle of His quickly transmits the impulse to the left and right bundle branches and into the ventricles, resulting in a synchronized contraction of the ventricles.

Detailed explanation-2: -Purkinje fibers They send electrical signals very quickly to your right and left heart ventricles. Your Purkinje fibers are in the subendocardial surface of your ventricle walls. The subendocardial surface is part of the endocardium, the inner layer of tissue that lines your heart’s chambers.

Detailed explanation-3: -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-4: -Impulses pass slowly through the atrioventricular node. Impulses are carried by the Purkinje fibers from the bundle branches to the ventricular walls.

Detailed explanation-5: -The left bundle branch conducts impulses to the left ventricle, and the right bundle branch conducts impulses to the right ventricle. Conduction may be blocked in the left or right bundle branch. The left bundle branch further divides into two branches, called the anterior and posterior fascicles.