Question

multiple choice question
where is the sa node located?

in the right atrium near the superior vena cava opening
in the left atrium near the pulmonary arteries openings
in the interventricular septum between the ventricles
in the interatrial septum near the ventricles

Explanation:

The sino - atrial (SA) node is the natural pacemaker of the heart. It is located in the right atrium near the opening of the superior vena cava.

Answer:

In the right atrium near the superior vena cava opening