The _____ veins drain the blood from the kidneys.

Question

BlackTom AI · Accepted Answer

Renal veins drain the blood from the kidneys, returning filtered, deoxygenated blood to the systemic circulation.

Relevant knowledge points and concepts:
- Vascular anatomy of the kidneys: each kidney receives arterial blood via a renal artery and returns venous blood via a renal vein. 
- Venous return pathway: renal veins empty directly into the inferior vena cava (IVC), typically at the level of the L1 vertebra.
- Distinction from other venous systems: hepatic veins drain the liver; mesenteric veins drain the intestines and feed the portal vein; gonadal veins drain the testes or ovaries and have different drainage patterns.

Step-by-step reasoning:
1. Identify the organ in question (kidneys) and recall that the paired renal veins are specifically named for draining each kidney.
2. Trace the normal flow: abdominal aorta → renal artery → kidney (filtration and exchange) → renal vein → inferior vena cava → heart.
3. Compare this with the other options:
   - Hepatic veins: blood from the liver flows through hepatic veins into the IVC after passing through hepatic sinusoids; they do not directly drain kidneys.
   - Mesenteric veins (superior and inferior): these drain the intestines and join to form the portal venous system, which goes to the liver, not directly to the IVC from the kidneys.
   - Gonadal veins: these drain ovaries/testes; the right gonadal vein typically drains into the IVC while the left drains into the left renal vein — they are for gonads, not the kidneys.

Why the correct answer is correct:
The term “renal” specifically refers to the kidneys. Renal veins are anatomically and functionally the vessels that collect venous blood from the kidneys and convey it to the IVC. None of the other named veins are responsible for kidney drainage.

Why the other options are incorrect:
- Hepatic: drains liver, not kidneys.
- Mesenteric: drains intestines into the portal system, not kidneys.
- Gonadal: drains reproductive organs; only the left gonadal may drain into the left renal vein, but gonadal veins themselves are not the primary drainage for kidneys.

Conclusion: The correct choice is Renal, which matches the provided answer.

The _____ veins drain the blood from the kidneys.单项选择题

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