What is the largest vein in the human body?

Answer: Veins:

Veins are blood vessels that bring deoxygenated blood to the heart, except carrying deoxygenated blood to the heart, except in the pulmonary vein.

The human body’s largest vein:

• The vena cava is the largest vein inside the human body, consisting of superior as well as inferior vena cava.
• The inferior vena cava runs parallel to the right-hand side of the vertebral column, posted towards the abdominal cavity.
• This vein returns deoxygenated blood from the middle and lower body to the heart’s right atrium of the heart.
• The superior vena cava transports deoxygenated body fluids from the upper—body to the right side of the heart’s atrium of the heart.