What is a pulmonary vein? A vessel carrying oxygen -poor blood from the heart to the lungs A vessel carrying oxygen-poor blood from the lungs to the heart A vessel carrying oxygen-rich blood from the heart to the lungs A vessel carrying oxygen-rich blood from the lungs to the heart Question 49 Where does oxygen-rich blood enter the heart? On the left side of the hearth Through the capillaries Through the femoral artery On the right side of the heart