atrial
Atrial means pertaining to the upper chamber of the heart.
The heart has upper and lower chambers.
The combining form for the upper chamber of the heart is "atri/o".
Cardiothoracic means pertaining to the heart and lung cavity.
The atria are found in the heart, specifically in the upper chambers. There are two atria in the heart, the left atrium and the right atrium, which receive blood from the veins and pump it into the ventricles.
The upper chamber on the right side of the heart.
The left atrium
The left atrium
The lower chamber is the ventricle, and there are 2 upper chambers (they are known as atria).
The right atrium (upper chamber) and the right ventricle (lower chamber)
its location is in the upper heart chamber that is smaller than a ventricle.
Right Atrium