NEET PG DENTAL EXAM

Detailed explanation-1: -The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers (atria) to contract. The signal then passes through the AV (atrioventricular) node to the lower heart chambers (ventricles), causing them to contract, or pump. The SA node is considered the pacemaker of the heart.

Detailed explanation-2: -One common cause of AV nodal block is likely to require a permanent pacemaker, namely, myocardial infarction (heart attack). The AV node receives its blood supply from the AV nodal artery; in 90% of people this artery branches from the right coronary artery.

Detailed explanation-3: -The atrioventricular (AV) node is a small structure in the heart, located in the Koch triangle, [1] near the coronary sinus on the interatrial septum. In a right-dominant heart, the atrioventricular node is supplied by the right coronary artery.

Detailed explanation-4: -The atrioventricular node or AV node electrically connects the heart’s atria and ventricles to coordinate beating in the top of the heart; it is part of the electrical conduction system of the heart.