Blood enters which chamber of the heart after passing through the pulmonary veins?

Blood enters the left atrium of the heart after passing through the pulmonary veins. This is because the pulmonary veins are responsible for returning oxygenated blood from the lungs to the heart. After the blood is oxygenated in the lungs, it flows through the pulmonary veins and enters the left atrium. From the left atrium, the blood then moves into the left ventricle, which pumps it out to the rest of the body. Thus, the left atrium acts as a receiving chamber for blood returning from the pulmonary circulation.