Carries blood from lower part of body to right atrium

Inferior vena cava

Explanation:

The inferior vena cava is a large vein that empties into the right atrium of the heart. It carries unoxygenated blood from the lower extremities. It also brings blood from the pelic area and the abdomen. The inferior vena cava coverges with the superior vena cava, which on the other hand, carries blood coming from upper part of the body.