Which part of the heart collects oxygen-poor blood from the body?

The right atrium is responsible for collecting oxygen-poor blood from the body. This chamber receives deoxygenated blood through two major veins: the superior vena cava and the inferior vena cava. The blood collected in the right atrium is then directed into the right ventricle, which subsequently pumps it to the lungs for oxygenation.

The left ventricle, on the other hand, is involved in pumping oxygen-rich blood to the rest of the body after it has been received from the left atrium. The left atrium collects oxygen-rich blood from the lungs, not deoxygenated blood from the body. The right ventricle is tasked with moving the deoxygenated blood into the pulmonary arteries that lead to the lungs but does not collect blood itself. Thus, the right atrium is the key player in receiving oxygen-poor blood, making it the correct answer.