The Heart's Receiving Chamber: Right Atrium Explained

What happens to blood after it returns from the body?

It enters the right atrium, the upper chamber on the right side of the heart. The superior and inferior vena cavae deliver systemic venous blood, while the coronary sinus returns much of the venous blood from the heart muscle itself. The right atrium then passes blood through the tricuspid valve into the right ventricle.

The right atrium also contains the sinus node, the heart's primary pacemaker, which initiates the electrical signals that help coordinate each heartbeat.

Watch this Body Spectra 3D animation to see how the right atrium receives, collects, and passes blood onward.

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