Final answer:
The left atrium is the chamber of the heart that receives oxygen-rich blood from the lungs during pulmonary circulation.
Step-by-step explanation:
The chamber of the heart that receives blood returning from the lungs during pulmonary circulation is the left atrium. When blood has been oxygenated in the lungs, it returns to the heart via the pulmonary veins, and the left atrium acts as the receiving chamber for this oxygen-rich blood. From the left atrium, blood then flows through the mitral valve into the left ventricle, which will subsequently pump it out to the systemic circulation to supply the body with oxygenated blood.
The chamber of the heart that receives blood returning from the lungs during pulmonary circulation is the left atrium. After gas exchange in the pulmonary capillaries, blood high in oxygen returns to the left atrium through the pulmonary veins. From the left atrium, the blood flows through an opening into the left ventricle.