SA blocks and second-degree AV block type I would occur in occlusion of which artery?

In the context of cardiac anatomy and physiology, the right coronary artery is primarily responsible for supplying blood to the right atrium, most of the right ventricle, and parts of the conduction system of the heart, including the sinoatrial (SA) and atrioventricular (AV) nodes.

When there is an occlusion of the right coronary artery, it can lead to ischemia or infarction in these critical areas, potentially resulting in SA blocks and second-degree AV block type I, which is also known as Wenckebach block. This condition manifests as progressive prolongation of the PR interval until a QRS complex is dropped, indicating a failure of conduction through the AV node.

Since the SA node is primarily dependent on the right coronary artery for its blood supply in most individuals, occlusion in this artery can directly affect the heart's electrical conduction. Therefore, the most accurate answer is that occlusion of the right coronary artery would cause SA blocks and second-degree AV block type I.