The portion of the intrinsic conduction system located in the superior interventricular septum is the sinoatrial node.
True
False
The correct answer and explanation is:
Correct Answer: False
The portion of the intrinsic conduction system located in the superior part of the interventricular septum is the atrioventricular (AV) bundle, also known as the bundle of His, not the sinoatrial (SA) node.
The sinoatrial (SA) node is actually located in the right atrium, near the entrance of the superior vena cava. It serves as the natural pacemaker of the heart, generating electrical impulses that initiate the heartbeat. These impulses spread through the atria, causing them to contract and push blood into the ventricles.
The electrical signal then reaches the atrioventricular (AV) node, which is situated at the junction between the atria and ventricles. From there, the impulse travels into the AV bundle (bundle of His), which is located in the superior portion of the interventricular septum. This bundle is the only electrical connection between the atria and ventricles, allowing the signal to pass into the ventricles.
The AV bundle quickly splits into the right and left bundle branches, which run along the interventricular septum toward the apex of the heart. These branches then continue into the Purkinje fibers, which distribute the electrical impulse throughout the ventricular walls, prompting them to contract and pump blood to the lungs and the rest of the body.
In summary, the SA node is located in the right atrium and not in the interventricular septum. The portion of the conduction system found in the superior part of the interventricular septum is the AV bundle, which plays a critical role in transmitting electrical impulses from the atria to the ventricles. Therefore, the statement is false.