It is the most common tumor of the heart, and occurs in the right atrium.

Next he opened the right atrium of the heart.

The blood then moves to the right atrium of the heart.

They decide to send another pulse, this time to the right atrium.

The blood eventually returns to the right atrium, low on oxygen, and the process starts again.

These two great vessels empty into the right atrium of the heart.

Behind the crest of the right atrium the internal surface is smooth.

The pacemaker is located in the wall of the right atrium.

With enough pressure, blood may travel from the right atrium to the left.

When blood returns to the heart from the rest of the body, it flows into the right atrium (1).