Question

fill in the blank question
the portion of the cardiac conduction system located in the right atrium near the opening of the superior vena cava is the

Explanation:

The sino - atrial (SA) node is located in the right atrium near the opening of the superior vena cava and is the natural pacemaker of the heart, initiating the electrical impulses that regulate the heartbeat.

Answer:

sino - atrial node; SA node