The azygos vein drains blood from the ________ into the superior vena cava.

A) head
B) upper arm
C) kidneys
D) thorax
E) abdominal wall

Azygos Vein

A vein running up the side of the thoracic vertebral column, draining blood from the chest wall and upper lumbar region into the superior vena cava.

Superior Vena Cava

A major vein carrying deoxygenated blood from the upper half of the body to the heart's right atrium.

Thorax

The part of the body located between the neck and the abdomen, enclosing the chest and containing the heart and lungs; it is protected by the rib cage.