The sequence of flow of blood in the hepatic portal system of a mammal is

Options

A. caudal vein, hepatic vein, liver, posterior venacava
B. intestine , liver, hepatic vein, posterior vena cava
C. kidney, liver, intestine, sinus venosus
D. posterior venacava, intestine , liver , hepatic vein, portal vein

Answer

To determine the sequence of blood flow in the hepatic portal system of a mammal, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding the Hepatic Portal System**:
- The hepatic portal system is a network of veins that transport blood from the digestive organs (such as the intestines, stomach, and pancreas) to the liver.

2. **Starting Point - Intestine**:
- Blood is first collected from the capillaries of the intestines. This blood is rich in nutrients absorbed from food but is also deoxygenated.

3. **Flow to the Liver**:
- The blood then flows through the hepatic portal vein, which carries it directly to the liver. This is a crucial step as the liver processes the nutrients and detoxifies the blood.

4. **Processing in the Liver**:
- In the liver, the blood undergoes various metabolic processes, including the storage of nutrients, detoxification, and production of important proteins.

5. **Exit from the Liver**:
- After processing, the blood exits the liver through the hepatic veins. These veins transport the now processed blood away from the liver.

6. **Final Destination - Posterior Vena Cava**:
- The hepatic veins then drain into the posterior vena cava, which returns the blood to the heart for reoxygenation and circulation throughout the body.

### Final Sequence:
- The correct sequence of blood flow in the hepatic portal system is: **Intestine → Liver → Hepatic Vein → Posterior Vena Cava**.

### Conclusion:
- Therefore, the correct answer to the question is **Option B**.

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