Amino acids are transported from the intestine to liver by

Options

A. Hepatic artery
B. Hepatic portal vein
C. Pulmonary vein
D. Hepatic vein

Answer

To solve the question of how amino acids are transported from the intestine to the liver, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Blood Vessels**:
- First, we need to identify the relevant blood vessels involved in transporting substances to the liver. The key vessels to consider are the hepatic artery, hepatic portal vein, pulmonary vein, and hepatic vein.

2. **Analyzing the Hepatic Artery**:
- The hepatic artery carries oxygen-rich blood and nutrients to the liver. However, it does not specifically transport amino acids from the intestine.

3. **Examining the Hepatic Portal Vein**:
- The hepatic portal vein is crucial as it is the major blood vessel that connects various organs to the liver. It collects blood from the gastrointestinal tract, including the intestines, spleen, pancreas, and stomach, and transports it directly to the liver.

4. **Considering the Pulmonary Vein**:
- The pulmonary vein carries oxygenated blood from the lungs to the heart. It is not involved in transporting substances from the intestine to the liver, so it can be ruled out.

5. **Looking at the Hepatic Vein**:
- The hepatic vein drains deoxygenated blood from the liver into the inferior vena cava. It does not transport blood from the intestine to the liver, so it is also not the correct answer.

6. **Conclusion**:
- Since the hepatic portal vein is responsible for carrying blood from the intestine (and other organs) to the liver, we conclude that amino acids are transported from the intestine to the liver by the **hepatic portal vein**.

### Final Answer:
Amino acids are transported from the intestine to the liver by the **hepatic portal vein**.

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