What is the primary function of the right atrium in the circulatory system?

The primary function of the right atrium in the circulatory system is to receive deoxygenated blood from the body. This blood is returned to the heart from the systemic circulation through two major veins: the superior vena cava and the inferior vena cava. The right atrium acts as a holding chamber for this blood before it moves into the right ventricle, which then pumps the deoxygenated blood to the lungs for oxygenation. The right atrium plays a crucial role in maintaining efficient circulation, allowing for a continuous flow of blood through the heart and to the lungs for gas exchange.