The SA node is in the upper wall of the right atrium, where it joins the superior vena cava. This large vein takes oxygen-poor blood from the upper part of the body to the heart.

Tricuspid: When blood has been around the body and needs more oxygen, it comes back to the heart’s right atrium. The tricuspid valve sits between the right atrium and right ventricle, allowing ...

In lungfish, the heart is partially divided into a right and left atrium. The sinus venosus opens into the right side of the atrium. Vessels from the lung return oxygenated blood to the left atrium ...

Right ventricle: After the right atrium, the blood moves into the right ventricle Left atrium: Once the blood leaves the heart to receive fresh oxygen from the lungs, it comes back to the heart ...

Right atrium functions as the entryway to the heart, pushing blood towards right ventricle and the lungs. It also houses the pacemaker of the heart, the sinoatrial node, that initiates and maintains ...

The superior vena cava begins behind the sternum (breast bone) near the right first rib. It travels down and drains into the right atrium at the level of the third rib.

The tricuspid annulus has very little fibrous tissue or collagen. Adipose tissue fills the interventricular space between the right atrium and ventricle on the anterosuperior and inferior sides ...

Ischemic heart disease and heart failure are associated with previously unknown changes in the right atrium of the heart, a new study shows. The groundbreaking study reveals how various forms of heart ...