Question

What is the major vein leading into upper right atrium?

Answer 1

There are two major veins that bring deoxygenated blood to the right atrium: the superior vena cava and the inferior vena cava.

Explanation:

The superior vena cava (called superior because in position it is over the other) carries deoxygenated blood from the arms and upper body to the right atrium.

The inferior vena cava (called inferior because in position it is below the other) carries deoxygenated blood from the legs and lower body to the right atrium.