The veins that empty the blood from the lungs to the heart?

Answer 1

The pulmonary artery carries the blood from the right side of the heart to the lungs. The pulmonary vein then returns the oxygenated blood to the left side of the heart where it is pumped along the aorta->arteries->arterioles->capillary bed. It is then returned to the heart via venules->veins->inferior/superior vena cava.

Answer 2

There are actually two sets of arteries and veins going to and from the lungs.

The first set are the pulmonary artery and vein. The pulmonary artery takes blood from the right atrium, takes it to the lungs where the blood is oxygenated and loses some of its carbon dioxide. It is then taken back to the heart by the pulmonary vein, which is the only vein in the body to carry fully oxygenated blood.

The other set of vessels carrying blood to the lungs are referred to the bronchial vessels, and supply oxygen and nutrients to the lung tissue itself. These arise from the thoracic aorta or intercostal vessels and run alongside the airways (trachea, bronchi, bronchioles, etc) and much of the blood is returned via the pulmonary vein due to a large bronchial-to-pulmonary shunt that exists via many anastomoses between the two blood supplies.

Answer 3

The pulmonary veins carry oxygen rich blood. They are the only veins to have that much oxygen.

Answer 4

Pulmonary veins.