What returns blood from the kidneys?

• A. Renal arteries
• B. Renal veins
• C. Iliac veins
• D. Common carotid veins

Answer: (B)

The renal veins are responsible for returning deoxygenated blood from the kidneys back to the heart. After the kidneys filter blood, waste products and excess substances are removed, and the clean blood is collected and transported by the renal veins, which drain directly into the inferior vena cava. This is the primary pathway for the blood to re-enter circulation after it has been processed by the kidneys.

In contrast, renal arteries, which are incorrectly associated with this question, carry oxygenated blood to the kidneys, enabling the filtering process. The iliac veins are also involved in draining blood from the lower body but do not specifically return blood from the kidneys. The common carotid veins, which primarily transport blood from the head and neck, have no connection with renal circulation. Understanding the specific roles of these vessels highlights the importance of the renal veins in the venous return of blood from the kidneys to the heart.