What is the name of the largest vein that carries blood from the lower extremities and abdominal organs to the heart?

The largest vein that carries blood from the lower extremities and abdominal organs to the heart is known as the inferior vena cava. This crucial vessel is responsible for transporting deoxygenated blood collected from the lower parts of the body back to the right atrium of the heart. The inferior vena cava receives blood from various veins that drain the lower limbs, pelvis, and abdomen, making it essential for maintaining proper circulation throughout the body.

The superior vena cava, while also significant, is responsible for carrying blood from the upper body to the heart, specifically from the head, neck, arms, and upper trunk. The coronary vein is involved in draining blood from the heart muscle itself. The azygos vein primarily serves to drain blood from the thoracic wall and upper lumbar region into the superior vena cava. Thus, the role of the inferior vena cava in returning blood from the lower body to the heart distinguishes it as the largest of these veins.