Which blood vessel takes blood away from kidney ?

Options

A. Renal portal vein
B. Renal vein
C. Afferent arteriole
D. Efferent arteriole

Answer

To solve the question "Which blood vessel takes blood away from the kidney?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of Blood Vessels**:
- Blood vessels are primarily classified into arteries and veins.
- Arteries carry blood away from the heart, while veins carry blood towards the heart.

2. **Identify the Blood Flow in the Kidney**:
- The renal artery brings blood from the heart to the kidneys for filtration.
- After the blood is filtered in the kidneys, it needs to return to the heart.

3. **Determine the Vessel that Carries Blood Away from the Kidney**:
- The blood that has been filtered in the kidneys is carried away by a specific vein.
- Since we are discussing the kidneys, the term associated with them is "renal".

4. **Identify the Correct Blood Vessel**:
- The blood vessel that takes filtered blood away from the kidney is the renal vein.
- The renal vein transports this blood to the inferior vena cava, which then carries it back to the heart.

5. **Eliminate Incorrect Options**:
- The renal portal vein does not take blood directly to the heart; it carries blood to the kidneys first.
- The afferent arteriole brings blood to the kidney, while the efferent arteriole takes blood away from the glomerulus but does not carry it to the heart.

6. **Conclusion**:
- Therefore, the correct answer to the question is the renal vein, as it is the vessel that takes blood away from the kidney.

### Final Answer:
**The blood vessel that takes blood away from the kidney is the renal vein.**

---