The blood vessel which brings oxygenated blood from lungs towards the heart of frog

Options

A. Pre caval vein
B. Post caval vein
C. Pulmonary vein
D. Pulmonary artery

Answer

To determine the blood vessel that brings oxygenated blood from the lungs to the heart of a frog, we can analyze the options provided and understand the functions of each blood vessel.

### Step-by-Step Solution:

1. **Understanding the Options**:
- The options given are: pre-caval vein, post-caval vein, pulmonary vein, and pulmonary artery.

2. **Analyzing Pre-Caval and Post-Caval Veins**:
- The **pre-caval vein** (anterior vena cava) carries deoxygenated blood from the anterior (front) parts of the body to the right auricle of the heart.
- The **post-caval vein** (posterior vena cava) carries deoxygenated blood from the posterior (back) parts of the body to the right auricle of the heart.
- Both of these veins are responsible for transporting deoxygenated blood, not oxygenated blood.

3. **Examining the Pulmonary Vein**:
- The **pulmonary vein** is specifically responsible for carrying oxygenated blood from the lungs to the left auricle of the heart.
- This is a crucial function as it helps in delivering oxygen-rich blood to the heart, which can then be pumped to the rest of the body.

4. **Considering the Pulmonary Artery**:
- The **pulmonary artery**, on the other hand, carries deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.
- Therefore, it does not bring oxygenated blood to the heart.

5. **Conclusion**:
- Based on the analysis, the blood vessel that brings oxygenated blood from the lungs towards the heart of a frog is the **pulmonary vein**.

### Final Answer:
The correct answer is **pulmonary vein**.

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