What is the Largest Vein in the Body

Question

What is the largest vein in the body?
A) Circle of Willis
B) Vena cava
C) Portal vein
D) Jugular vein

Accepted Answer

The vena cava is the largest vein in the body, with two branches - the superior vena cava which carries blood from the upper body to the heart, and the inferior vena cava which carries blood from the lower body to the heart. The Circle of Willis is a network of arteries in the brain, the portal vein carries blood from the digestive organs to the liver, and the jugular vein is a large vein that carries blood from the head and neck to the heart.