Venous blood below the diaphragm is returned to the heart by the:

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Quizplus · Accepted Answer

The inferior vena cava is the main vein that returns deoxygenated blood from the lower body, including all veins below the diaphragm, to the right atrium of the heart. The splenic vein drains blood from the spleen, pancreas, and stomach, and the hepatic portal vein carries blood from the digestive organs to the liver. The coronary veins drain blood from the heart muscle itself.

Venous Blood Below the Diaphragm Is Returned to the Heart