What are the two upper chambers of the heart called?

The two upper chambers of the heart are referred to as the atria. Each atrium, right and left, plays a crucial role in the heart's function by receiving blood that returns from the body and lungs. The right atrium collects deoxygenated blood from the body through the superior and inferior vena cavae, while the left atrium receives oxygenated blood from the lungs via the pulmonary veins.

The atria are important in the heart's overall operation, as they facilitate the movement of blood into the lower chambers, known as the ventricles, which then pump the blood out to the lungs and the rest of the body. Understanding the structure of the heart and the roles of its chambers is vital for grasping cardiac physiology and the significance of blood circulation in maintaining overall health.