In which chamber of the heart does deoxygenated blood enter?

Deoxygenated blood enters the right atrium of the heart. This chamber is responsible for receiving blood that has circulated through the body and has released its oxygen to the tissues. The blood returns to the heart via two large veins: the superior and inferior vena cavae. Once in the right atrium, the blood moves through the tricuspid valve into the right ventricle, where it is then pumped to the lungs for oxygenation.

Understanding the function of the right atrium is critical for grasping the overall flow of blood in the circulatory system, particularly how oxygen-poor blood is handled before being sent to the lungs.