Definitions for "Right atrium"
located in the upper right side of the heart, along with the right auricle, acts as a temporary storage chamber so that blood will be readily available for the right ventricle.
the chamber of the human heart in which oxygen-poor blood enters through a major vein called the vena cava.
One of the four chambers of the heart in which oxygen-depleted blood that contains carbon dioxide enters. Reference: H1