The major vein returning blood to the heart from all areas below the diaphragm is the:

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The inferior vena cava is the largest vein in the body and returns blood from all areas below the diaphragm to the right atrium of the heart. The femoral vein returns blood from the lower extremities, while the pulmonary vein returns oxygenated blood from the lungs. The superior vena cava returns blood from the head and upper extremities, and the jugular vein returns blood from the head and neck.

The Major Vein Returning Blood to the Heart from All