Does oxygenated or deoxygenated blood flow through the right atrium?

Answer 1

Both oxygenated and deoxygenated blood flow through the right atrium. Deoxygenated blood from the body returns to the heart through the superior and inferior vena cava and enters the right atrium. Oxygenated blood from the lungs returns to the heart through the pulmonary veins and also enters the right atrium. The right atrium then pumps blood to the right ventricle, which will then pump blood to the lungs for oxygenation.