What is the primary function of the right atrium?

The primary function of the right atrium is to receive deoxygenated blood from the body through the superior and inferior vena cavae. This chamber acts as a holding area for blood returning from the systemic circulation before it is pumped into the right ventricle. Once filled, the right atrium contracts and sends the deoxygenated blood into the right ventricle, which then directs it to the lungs for oxygenation.

Understanding the role of the right atrium is essential in grasping the overall circulatory system. Its function is crucial for maintaining the flow of blood through the heart and facilitating the oxygenation process that occurs in the lungs. This is a fundamental component of the cardiac cycle, ensuring that blood is effectively transported to where it is needed for respiration and metabolic processes.