Oxygen-depleted blood is pumped back into the heart by entering through which cardiac chamber?

Oxygen-depleted blood returns to the heart through the right atrium. This chamber receives blood from the body's systemic circulation via two major veins: the superior vena cava and the inferior vena cava. The blood that enters the right atrium is low in oxygen and high in carbon dioxide, having delivered its oxygen to the body's tissues.

From the right atrium, the oxygen-poor blood moves into the right ventricle, which then pumps it to the lungs for oxygenation through the pulmonary arteries. The flow of blood through the heart is essential for maintaining proper circulation and respiration, highlighting the crucial role of the right atrium as the entry point for deoxygenated blood entering the heart. This function is vital for the continuous cycle of oxygen delivery and carbon dioxide removal in the body.